Good work on getting out a submission! I think the art is pretty good for that simplistic black and white style. I think some suggestions I'd offer is with the player and enemies, make them with a transparent background that way their black squares won't show up over some of the white objects.
Also, maybe a health bar or something a little more forgiving. I think the lightest taps on the spikes had me reeling a bit when I thought I had proper clearance.
A great start though! Keep it up! I'm sure you could turn this into something great given some extra time in the oven.