I like the concept and aesthetic, though I do wish you built up gas a bit faster (perhaps rising faster to compensate), as the game's pace can feel a hair sluggish.
Also ran into a bug with the blue projectile enemies: the more their projectiles slam me into a wall, the more out of sync the camera gets. This caused me to soft lock on the level with several projectile enemies and the block in the middle, as the camera moved to where I was off screen and the projectiles kept resetting my gas meter, so I couldn't die to reset the level.