Some things I noticed whilie playing:
The hitbox for the spikes seem misaligned. They stick out a bit to the left, and don't cover the right side.
In the Webbrowser, when I press a button, it turns orange, but doesn't turn green when I release it.
The score is stored between levels, but if you press restart after defeat, you loose all of it. If you go home and select a level you do keep them.
The effects that happen when you stomp on an enemy feel a lot like getting hit, which was confusing at first.