Cool concept here. I would give you some advice:
- MUSIC: Make it more synthy something like this:
- CONTROLS: Add acceleration / deceleration (the movement felt very janky)
- CHALLENGE: I found the game quite easy (in challenge mode), maybe make the firewalls move side to side?
And finally you should definitely export the game for native systems, because the HTML5 version can be very buggy (especially in full-screen)