SandStoryBook

Each door is a checkpoint, press R to reset the level or jump off the edge. 

Press K after the level1, level 2 and level 3 to activate some of the environmental helper.

3D:

W,A,S,D for movement, Space for jumping, Q/E for angle rotation, F for opening the door, L for Up/Down angle adjustment. 

Platform:

A,D for movement, W for jumping, F for opening the door.