Very enjoyable! I liked how the deeper you went the louder the music got, helping to build tension. I think the gameplay got stale after a bit, and having more impactful upgrades or more unique upgrades could help with increasing replayability. There weren't really any upgrades I got that changed my playstyle, maybe if they did more (i.e. the speed upgrade made you a lot more faster than it does, or the invincibility has a less strong but permanents effect making it a lot more viable. The art was nice and did a got job of conveying the mood, even with the surprising mishmash of styles. I think the hitboxes were a little unfair, what seemed like clear near misses to me still damaged me. It's much more fun for the player to have a more generous hitbox, giving more satisfying escapes. Overall, great job!