you gave the skateboard believable weight and momentum, that couldn't have been easy to pull off.
I actually thought this was stop motion for the first 20 seconds or so, whether or not that was intentional I think it was caused by animating on 2s
I would be more careful with that, usually when you have forground elements going at a different framerate to the background scrolling it will cause an ugly stuttering effect, it didn't really happen here because your background was so simplistic
very good use of sound design too
sorry about how unorganized this review is lol