What if you could grab a laser? And swing around a laser emitter with it?
This is just a silly little physics puzzle game mechanic prototype (GONE WRONG).
Currently it feels horrible to control, but I'm sure there's some simple way to do it where it wouldn't.
The game would be mechanically 2D but could be 3D and use this cool laser effect.
I don't know what the puzzles would be though. Especially since you can grab it right near the emitter and essentially drag the laser emitter around directly. So it's probably not a good mechanic idea anyways. Oh, maybe the areas where you can interact are limited as part of the level design (i.e. there's a grate or some tinted glass in between you and the laser). That could probably work. I dunno.
P.S. WARNING: LINKS TO TV TROPES Hard Light / Pure Energy I guess.