It was a nice short game but it didn't really fit the theme. A few things I suggest is:
- Add sound effects. There is a website called bfxr.net where you can make very simple but effective "8-bit" sounds
- Add "untrustful" mechanics, such as platforms disappearing when you jump on them.
- Use a different font of your choice, I recommend a "pixely" type of font, since it's a pixelated game.
Awesome game just make sure you implement some of these ideas and other people's ideas in this comment section to further improve your game or the next game you make.