OMG I barely made it, it is quite tough at the end! I liked the minimalistic vibe of it.
BTW if you get a power-up and click escape and back the game starts running but the powerup menu is still there, restricting clicking anything else (yes, I forgot you should click the X instead of ESC but anyway)
Some ghosts remind me of the Gaster from Undertale, not sure if that was intended but cool detail.