Good job on making a full game.
The artstyle was nice, but I feel like some of the objects did not clearly convey their presence. For example, in the first level I only saw the spikes after touching them. It would have been nice to have used the red tones here to show danger. In the second level I didn't see the jump pads, and had no idea why my character was suddenly jumping. It would have been nice to make the jumping pads a bit more visible, maybe in the form of a spring.
I must have missed something, cause I couldn't figure out how to open the door in the second level. I changed to ghost form, tried using the interact button, to no avail.
Like others mentioned, a small background music would have also been nice.