Use the arrow keys or WASD to move. Press up to jump (hold it to jump higher and bounce farther off of springs). Press left and right to move. I don't know if I will turn this into a full game. The tile-map plus the vector graphics are causing performance problems, so please tell me if you think vector art is worth the lower frame-rate on older hardware. Also there is a level editor of sorts. Press E and D at the same time to enter edit mode. Use the mouse to add blocks. Press Enter/Return and then type a letter to select a block (the blocks are "a" through "g" but only "a", "b" and "f" work properly.) Press 1, 2, 3, and 4 to change the pen size. Hover over a block and press X to delete it. Hold M and use the mouse to move.
Update: added music (from Knuckles Chaotix) Check one of my best projects Scratch Cat's Robot. https://scratch.mit.edu/projects/558146744/ RAM Warning, you need lots of ram to run it; at least 8GB.