For a 'very, very unfinished' game this sure feels finished! I'm hoping you were going for the NES or Gameboy look and feel because that's what I got and I liked it.
I try to make one constructive criticism on every entry I review, that's tough here because I imagine you had a plan for everything. I suppose I'd have to say that it would benefit from something interactive in the levels - friends, enemies, power ups, anything a bit dynamic.
Whatever forced you to submit early I hope you're OK, but you've done really great work in half the time. I wish there was a 'has cats' category because that should always be worth points!