SO polished, aesthetically. Really great job on presentation. I guess my minor little points of feedback would be that the ghost mode is, as I think you know, maybe not utilised to its fullest potential and also, there's a bit of a hitbox thing where standing on the edge of a 'safe' floor, when the adjoining wall has a spike on it, will actually get you hit by the spike.
Not much of an issue for a gamejam entry but if you're looking to move it forward, I'd maybe address that. Should be as simple as just moving the wall spikes down a few pixels or considering the hitbox's bounding box in relation to the player sprite.
That's so minor, though. Otherwise, really brilliant.