Cool concept and entry! I love the look and the movement of this game. The gameplay was pretty clever and well thought out considering this is a prototype too.
SPOILERS
I do have to say that if not for the leading gif, I do not know if I would have figured out that I had to drop the box on the first enemy to get the ammo and keep going. Honestly, the first time I played I ran past him and made it past the next two enemies, just to be stuck.
I did end up making it to the "boss" but I only had 1 health and died lol Check points would be really nice.
I did find one bug: it doesn't appear that you reset the internal kill count var after you die, so they go past the 4 max as you die more but keep killing the enemies over and over.
Overall, very cool and enjoyable though!
I would really really like controller support :)