...I think you can do it better, Veck. The cave FG looks pretty plain and boring and I don't like the palette choice at all, except maybe from the background which looks reasonable. And it looks empty too, where are the enemies?
Looks like you got some basic gimmick there though -- variable flowing water. You need now a proper planning, execution and setting up a proper appearance, too. You still have lot of time left, so don't give up! Be sure to update it so we can review more for you.