This is a really interesting idea, and I could tell you put a lot of work into the mechanics of your game.
To me though, the game did feel a bit overengineered imo. I didn't really ever pick up on what the different colored grid pieces each did, despite beating the game, and I also felt like the cards and stuff were really cool but there was like no risk when using them because you could just "restack" and just start over at any point, without losing any meat you fed the beast. I feel like if you added a way to reward good decisions and punish bad decisions when using your cards, the game loop would become much more engaging.
Also, I felt like the selecting card animations had a little too much movement, idk if you were inspired by Balatro at all but I would say it felt like that game's card movement (which is good), but just a little too extreme in my opinion.
I still thought this was a really neat game and I had fun killing the beast lmao :)