Don't know if i missed something but the timing with the spikes is really, really tight. Like, way too tight.
As others have already said though, the atmosphere is really nice. I also like the art generally. Some feedback for when I hit the enemies would have been nice. With some enemies I wasn't even sure they can be killed at all, because they took a few hits and, again, there was no feedback if that did anything.
But I really like the idea of having a short but kinda challenging game for a game jam :)