Bolatro + slay the spire? Who would say no to a game combining the 2 greatest deck builder of all time?
This is a very fun roguelike deckbuilder combat game! The art and music are also cohesive with the theme. Great job.!
Saw your clarification about using premade art, I would say that the selection of using premade art is also part of game design. So as long as you credit the author, you should at least take credit for selecting a premade asset that would fit into your game's theme.
This game's mechanic is very creative, interesting and have a lot potential!