I like the idea of this game, but it is simply boring. There is a lot more waiting than playing, and the upgrades and currency come so slowly. Rerolling your hand is inconsequential and should be done automatically when you have no cards. I'd highly recommend doing research into game economies. I like the art a lot, but you should definitely add more particles, sfx, and shaders/vfx. This idea has a lot of potential, but you should definitely take some inspirations from other roguelikes, auto battlers, and idle games.