Very nice game, loved the graphics and visual effects :D
The game itself would benefit from a better level design overall (for example, try to make gaps between platforms larger so that the character doesn't overshoot when it jumps), and from some user experience and mechanical overhaul, like adding coyote time, adding jump input buffering, ecc...
Also, you forgot to reset gravity to normal when you press the restart button, and sometimes the character gets stuck in platforms and the only thing you can do is restart the game.
Other than those little bugs and fixes, I think the game has potential to become a fast paced action endless runner, keep the same graphics, just maybe polish the animations a bit and add some more particles/sound effects, this would really make the game pop out and feel even better to play.
Good job :D