The Pixel art for the game is amazing, though the walking animation feels kind of awkward. It doesn't feel very creative though, as it seems like it just essentially followed what was said in the theme announcement of making the goal a spike.
Also, for some reason on Level 7, I wasn't able to jump, so I couldn't get far into the game.
If you decide to continue working on it, I would suggest polishing the walking animation and letting players use space to jump(unless space is for something else later).