It's a pretty unique take on the theme, especially since its done in three dimensions.
The jumping feels awkward, but Elidef covered that better than I could - though I also suspect there's some weirdness going on with the math that makes the jump favor cardinal directions?
I'll be honest, I don't think the reflection mechanic feels good as implemented, at least the way I ended up using it - if I want to go somewhere, I first have to look at it, rightclick, wait for the camera to zoom in, then turn around 180 degrees and left click, and then let gravity to do its thing while I'm too disoriented to know what's happening.
Still, with a bit of work and some tweaking this has the potential to end up as a pretty good Portal-esque FPS puzzler, and I want to give credit for going 3d :]