I'm killing the videos for a bit, since I can't record audio very well right now. BUT; here goes:
Minor issue:
Probably should have arrows as well as WASD, at least. Lot of people prefer all keys be rebindable, but a full menu for that might be above your ability right now. (minor)
Art:
The odd fluidity of your character style has an endearing quality to it; but I still think you should learn a bit of traditional sprite art. Look around PixelJoint a bit and learn the techniques. For some reason the abstract 'dude' in this reminds me of lemmings in how exaggerated and fluid his moves are...though there's obviously more pixels to him than a lemming. The fact the box literally says 'box' on it was amusing at first.
Magenta and Yellow are complimentary colors; which makes the palette very strong. :)
Mechanics/Design:
Your core mechanics have been done before; but the level designs that teach the player what your mechanics are and how to access them are very strong. The only major issue is the last level, which in no way makes it clear that we've suddenly switched to a level that takes up multiple screens after the rest of the game used single screen levels.
Overall:
3.5/5. Doing good; need to work on art and polish. And maybe come up with something more unique mechanically next time. Seeing some good growth from your first game though.