First of all, I love the game, it's just awesome, and when I found that it's just a single person developing it, I must say: I'm impressed.
I have some feedback. I played the game a lot (kind of addicted) and I hope you can get something out. A side comment on the uncommon vs elite card discussion, because it's frustrating for me too. It makes dual color decks even harder to build. Could you include a button to convert elite rewards into uncommon rewards? Could be a quick and simple solution.
1) bug report: Elemental Destroyer
I don't know what's wrong with it, but it seems it destroys way more than it should. Once AI played it, it destroyed all 7 ships I had, 6 of them with cost higher than 3, some even had shields... It also destroyed ships with cost higher than 3 in other occasions, and also more than one quite often. I'd love the card, if it did what it says, but it's incredibly OP with this bug. Unfortunately I couldn't figure out what it actually does, sometimes it does what it says.
2) kind of a bug report: Fusion Burst
It doesn't do what it says. It multiplies the current AMC with 1.5 instead. Interesting, still, as it allows for multiple hits on same target with increased effect (gave me a chaos demon with AMC above 300 and smth like 100+ attack quickly). I think I'd still prefer if it did what it says, as it is a bit OP if you draw two or more. Could be used on Hydra cards, if it'd do what it says, but as such it doesn't do much to Hydra. Adding 50 AMC would be an alternative, too. But whatever it does, it should say what it does. Dual color cost is perfect here, it's not OP, it totally fit's the themes. Love that card.
3) balancing: Star Drone
Really nice idea, but it is way too weak. Why don't you give it 150 or even 200 AMC no matter what. It wouldn't be OP, as it still needs smth else to give it a relevant attack. But that way it is useless. First, in a two color theme, it only triggers from one of them. Second, it's a middle class ship you want to bring out early, and not as 6th or 7th ship only. If I manage to play and keep 5 ships in HU/CA deck alive, I either won or Star Drone will do basically nothing. If I play it early, it costs too much for the weak body without effect. I would love to built a deck around it, but whenever I draw it I'd prefer to draw Tarogi or Support Drone. They both have at least some sort of synergy with Overseer. That deck still sucks, single color CC is just better.
3) balancing: Technomind
If I want to play dualcolor CA/TM, I cannot rely on this card. I cannot play it from my start hand, as it requires energy of both colors. This makes CA/TM unplayable. If it had 2 random energy cost, this issue would be solved, but it would stay a bad card compared to the other dual color structures, as I still couldn't play it first turn. 1 random color would be fine, otherwise it would still force you to choose your base generation accordingly...
4) balancing: Extinction vs Greater Grav Demon vs Hydranought
They basically cost the same, in total 11, 12, and 10, respectively. But Hydranought needs exact amounts of 2 colors, Extinction can use anything. Now their attack is 5, 4, 3. With Hydra, everything that matters is attack. So Extinction is better than the two others and can be played in any color. I think Extinction is way too cheap, it should be 15. Or it's attack should be 4. Or maybe even both. Or maybe it should self destruct if base is not artifact... Extinctions high defense even makes up for the lack of regeneration. In both my Hydra Decks I always prefer drawing Extinction over the one the deck is based on...
Btw, I love that AMC stopped Hydra cards from being totally OP, while you can still push them with the right action cards.
5) balancing: Anitmatter Weaponry vs Demonology
It's just weaker. No defense bonus, just one attack. Also it is played late in the game, when 2 energy is nothing. So rather put 3 attack and make it cost 8? Then I might consider Antimatter Weaponry again.
6) Finally I have a suggestion for a set of new cards. I think it is really difficult to build a two color deck that is actually as strong as a single color deck. Only exceptions are decks based on either Hydranought or Fusion Burst and one deck I use against Mercenaries only (based on Mirror Shield and Anti Screen). Unfortunately, I still couldn't try some combinations due to Technomind, or simply as I don't have the required dual color structure as it is an uncommon card.
Yet I never managed to include a working third color splash into a two color deck. I just never happen to find both the card and the needed energy before loosing...
I'd propose to include action cards that increase base generation in two colors. So that they are not OP they should have some cost, 3 to 5 maybe? They may have a theme fitting extra action, I could think about disable target ship for HU/TM for example. Deal 5 damage to target ship for HU/CA. Destroy target structure for GV/CA. You could also combine it with blueprint. If blueprint is 1, increase base generation for HU, if it is 0 increase it for TM. Things like that. And then, very important, they should not have costs of both colors, see problem of Technomind. It might be hard to include a feature like that, but maybe you can include cards cost X, which can be payed in any combination of HU/CA energy. Otherwise random energy cost could just be fine, as it does the same most of the time.
7) Resetting what Spectrum Core did long time ago (you can choose which color it produces) would make dual decks easier to build, too. Back in that time you could try fancy dual color decks with Spectrum Core and Solar Reflector and co. They had a bad energy support, but at least you could try smth initially.
One last comment:
I love Replicator Ghost. Perfectly fits the theme. Cool use of Blueprint, still not OP. Super card to buy just a bit time vs Mercenaries. I would love to see some more Blueprint cards. Maybe an action card that disables a ship, has Blueprint 2, but costs a lot like 8? Or a cheap ship card, just a 0/1 ship with some Blueprint. Or a plain card drawer, draw a card, Blueprint 2, costs 3. I'd also love an action card that gives target card in your hand blueprint 1 or even 2, should be expensive of course. I'd love to use that on Techno Mimic xD
So I hope you get some helpful feedback and maybe even inspiration from this...