It seems like you there was a lot that didn't get implemented. It happens though, but I'll only be able to give you general feedback.
- The first thing I noticed was that controls weren't listed on the gamepage or in the game. At the very least, I would make an effort to do that in the future.
- While I find the player art charming, it doesn't fit anything else visually because there's no other pixel art. Just shapes. Don't get me wrong, basic shapes can look great and I used them in my last MVM entry. I would try to be consistent.
- I think you should put some time into thinking about level design and player feedback in general.
Overall, don't give up.