These demos are to show how Round man would work in different enviroments, if you haven't guessed already.
This one is a water level, I think I did well on this. this only problem there should be, is the bomb sound. Try to just lay 1 bomb down, because if you lay more than 1, then only 1 bomb explosion sound will happen. I'll have that fixed when I know how to.
Up arrow - Tap it to swim higher
Down arrow - hold it down to swim down faster
Shift+left or right - hold both shift and left or right key to swim in that direction faster.
Z key - Press to lay a bomb. Lay the bombs next to the walls that are protecting the donuts to destroy the wall.
When all donuts are collected, there will be arrows to point you to the exit portal.