I think this has to be one of the cleanst movement mechanics I've seen on the jam. Puts mine to shame!
The game itself. Yep, like many here, I'm too dumb to work out! I did start spotting the differences, and that eery noise. But I just couldn't figure out when to go back and when to go forward!
But the atmosphere... GREAT! I think maybe I'm seeing some particle effects? Or maybe I'm going mad?
Regardless, putting this together in a week is superb. Well done.