I kind of just sprinted through each level until I got to the end. I don't really know why throwing coins is important, because the guards didn't really seem to interact with them much. The controls are also kind of wonky, like they're rotated slightly. When I press right, the character drifts up, and when I press up, the character drifts right, etc.
Also, I saw a prompt to press E near a guard so I did, and then a guard sprite filled my screen and I couldn't do anything. The level never restarts, I can't press E or move, clicking doesn't do anything.