And here I thought I'd be the only one dumb enough to try and make a Slay the Spire-type game in nine days! This was fun, and I really like how you incorporated the theme. At first I was a little wary of not getting to actually choose what new cards I got, but on reflection I think that actually really plays into the mutation aspect, and having to remove stronger cards to keep going is a fun twist. The art is also very good! Just a tip, the music doesn't loop—for web exports, you have to check the 'loop' option on the import panel for the audio file in godot and reimport it for that to work. Don't ask me why, it's a dumb quirk of the engine. The only thing I felt the game was really lacking in was content—more card variety, more enemies, etc.—but obviously that's a lot to ask for a jam game. Overall, good job!