Pretty cute little demo, even if very linear and unfinished! The art style is nice and the premise sounds interesting, I could definitely imagine the different rides as sublevels you can get into, like in Pizza Tower. The funniest bug by far was that you (the player) could actually write on the various placeholder labels throughout the level.
Aside from the obvious unfinished parts, I think the biggest issue is that the player and enemies seem to be a different resolution compared to each other and the background, making the player appear very thin. Regardless, good job getting the demo out, and good luck if you choose to keep working on it!