I like the sprite work a lot and the mechanics feel fairly solid, yet a little slow and clunky. The pacing of the game seems to move a little slow and I found myself zoning out a little, in a good and bad way, but I think that could be alleviated a lot just from the addition of some background music. As some others said it felt a little confined and like the levels could be more designed, as right now they just feel a bit like small spaces. Overall though there are some solid bones here, nice work!