Wow that's really a fun game. You use the game space so well (using prime numbers, finding all kinds of possible card effects for such simple rules). Right now I'm a bit stuck against prime Master 61 (i might go to the Lab and complete some Rooms since apparently you can get some cheat cards lol? i played the game on challenge mode). I was afraid with the energy number getting so big, the game would suffer from it and becomes less clear. It is sometimes annoying to count numbers together but the game gains depth in deckbuilding.
I'd say the game moves away from being a abstract boardgame (at the beginning you try to place your stones in the middle, occupying space etc, kinda like the game of Go lol), and the more you advance the more the game is just pure card game/deckbuilding lol.
I do like how it really feels like a puzzle game sometimes; where you need to design a deck to counter the opponent's deck. Even when I thought I had a broken deck, I could only use it once before I had to adapt my deck for my next opponents again lol. (like a deck made of 11-stone eggs, 49-stone to unfreeze, and a bunch of cycle cards). I didn't understand at first there's a 6 card limits in hand, so sometimes i was confused when i played the draw 2.
5/5! great game
edit: after beating level 61
Am I correct in assuming the late levels are very hard (impossible?) without the cards from the lab? I love how you somehow manage to raise the difficulty/challenge every time. The balancing is very good and it's very hard to break the game (maybe impossible, even cards like Draw 2 which usually just break card games, it's pretty hard to exploit it, since it also has anti synergy with negative cards that you can only play once and last), I did notice how for the 97 boss, you only have 85 Energy, which is not enough to play two 43-stones lol (the one that makes you next card free, i guess it would be too easy with the draw-2 stone). Often times I would think I have the strongest combinaison/synergy possible, and the next encounter I get beaten to a pulp. It seems it's highly map dependant which is a good thing.
okay now im stuck at 97 wow lol. I have to praise your AI (i don't know how hard is the decision tree), but it is pretty hard and good lol.
edit: i beat it, holy damn that was really tight lol.
my final deck: https://imgur.com/a/TxamvhQ
I beat the final boss but i'm still missing a stone? I guess i get it from the Mining Battles, but I don't really feel like playing those lol, great game!