Don't really get how the theme is implemented.
The level isn't well designed around the red cubes, and I don't understand how the red cubes really work. They make you dash and become invulnerable for a short moment (without visual clarity), but that led me to just fly through the roof and reach the ending.
The music resetting each time you die doesn't sound great and gets annoying if you try to beat the game properly without cheese.
Still, good job on finishing and submitting your game!