Hey there. First off, I'd like to thank you for taking the time to make a game like this. Rogue-lites and deck-builders are my jam and you got both!
However, I had a major issue with the game, that being that the aspect ratio seems to be off, I think I can only see the top left of the screen and there's no clear full screen option (double-clicking and ESC don't work). Here's a screenshot for reference: https://imgur.com/a/2AS8fmr
Just one thing: I think it's already there somewhere and I just can't see it due to the screen size problem, but there should be a replay button for when you die.
With that being said, I don't think I can give any other feedback on the game, which is a damn shame. I'll be waiting for the bug fix so I can try it.