The game is cool, level designs are nice, so good job!
Here's what I'd improve:
- The game's performance wasn't very good for me, specially if I played fullscreen, sound break a bit and it make it harder to jump around since it had low fps. Same happened to my game when I added lights effects. They are super pretty but browsers apparently have a really hard time with them so I had to remove them.
- Player controls can be improved, jumping was a little harder than it should, specially when jumping from a slope. Player should probably jump a little higher and move a little faster.
- This game needs to have a few lives so you don't die immediatly after getting hit the first time, and specially respawn checkpoints, starting from beginning gets frustrating really fast.
- There's no dying animation, simply suddenly taken to a game over screen which is quite surprising and not very appealing for the player