I love this game, it's so charming. I love the visuals and the mechanics which are easy to understand (ignore the fact that I didn't realise I had to play all cards and was wondering why I cant start the round) and the challenge in later rounds is very fun!
The only nitpicks are that the collisions for where you can't place cards is a tad restrictive sometimes and I found a bug where a card can disappear if you try place it somewhere it can't go (but it usually only visually disappears, and goes back to the deck, still invisible). But those are nitpicks/things that can be fixed easily.
Very well done! I got to level 14 before I was bested the giga-chad slime :D