It has some issues to be fixed, but overall, it's good.

1. Music doesn't need to reset every time you die; instead add a control for the music and make it loop.

2. Acceleration issues. You may need to slow the acceleration down.

3. Maybe it'll be a good idea to remove killbox on the left and right side of the screen and just add a collision box there instead.

Overall, it's quite great and addicting. Good work!