WASD, and space for 3D mode, arrow keys for 2D mode. To switch between 3D and 2D mode, press the respective numbers on the keyboard. In 3D mode, press R to restart and go back to (0,0). It is very basic 3D (could it even count as 3D?) same level as Sonic 2 special stages on the 3D. Enjoy it, make your own version, or recommend ideas to add.
Everything by me, if you use the engine, credit me