This game crept up on me for fun. It took me a while to figure out the UI—some things don't communicate unusable states or which are interactive vs purely indicators that well—but once I got my head around that I had a lot of fun.
One thing I'm trying to focus on with my own games (and didn't do very well with in this game jam) is giving the player interesting decisions to make on a regular basis. Your game was great for this. Even when the enemy was defeated I had to choose whether to keep fighting or heal and upgrade. Then, I had to choose upgrades, and which new skills to take on and sacrifice. Always keeping me thinking and questioning. Great work!
Loved the unique art, but the UI didn't match it so much. I found the font hard to read and something a little more organic would've fit nicer. For all that it is holy (if you update the UI) don't choose something like Papyrus, Comic Sans, Markerfelt etc. haha
Anyway, great mood, I liked the music too. Was the theme SCP?