You tried. You really did try, but unfortunately, it wasn't a very good try. The game was too short for it's own good, the controls feel floaty and annoying, the sprite felt needlessly stock when the other objects in the game seem to have been made by hand...
Here's what you could do to improve it...
1. Improve the sprites. Seriously. It doesn't look good.
2. Fix the coding. 'nuf said.
3. Make the game longer.
Just... Improve it. Okay? It's playable. That deserves at least some credit.