Fun! I see a lot of folks have already mentioned how well designed the level is, but, well, the level is well designed! I'm especially impressed with this because of how terrible I am at it, haha. This one just really has a great vibe in the exploration that really hits all the right Metroidvania points for me. And the art is very charming. Does a good job of looking great and being very readable.
One thing that was a bit frustrating to me was how enemies respawned as soon as you entered a room because sometimes I would step into a room to see that the way I was blocked and immediately have to backtrack, so I think it would have been nice to have at least a short buffer where if you reenter a room quick enough, enemies won't have respawned yet. Plus, it lets me feel good about how well I disposed of those slimes the first time, haha.
But overall, this one is great. I see you're already working on updating after the jam, and I can say with confidence that I'm looking forward to it!