Really good! The Slay the spire approach for paths and perks always works for this kind of roguelike. It does takes a while to understand at first perks, but if you have experience with Panel de Pon or other similar puzzle games you can just play normally until you get the gist of it.
I also had a hard time understanding how to use my active perks, it would be good to have all the controls and a bit more in depth tutorials of these mechanics on a more complete version of the game.
Overall, this is quite fun and the mechanics like passives for each character and the 4 block square are super fun to play around with when you manage to get those combos (it reminded me about Tetris on the N64).
I can't wait to see more progress on this project! Great job :)