On my first playthrough, I didn't even realize there were multiple levels. Did you add working doors to a later version? The third level was cool, yeah. I never figured out what the red light was for, though. Did you have something special planned for that?
It's cool what you did with the light-based system, but all in all I'd say I like where you're going with Arrow Pit more. But I think it'll work out no matter what project you ultimately decide to work on.