Very nice idea!
Combine your gameplay with a level design as follows
and the game could become a very unique and cool shooter!
this seems REALLY confusing to me, even with colours, i dont think i'd like that very much, i think this game should have simple levels, really simple, and focus on platforming like elements and more verticality, for example, every passage/door should be the height of atleast 2 humans
i think metroid styled levels:
http://www.youtube.com/watch?v=UilolE3jQmI&hd=1 would fit this more and i really like that you still use projectile weapons, if it was some energy thing, i'd lose interest
[EDIT]
now that i think about it, i think teleporters fit quite well, just make them teleporters instead of portals so you have your own style, also, you could look into 'one way' teleporters as to avoid players exploiting it
[EDIT 2]
hmm the blur and hit detection seem fine to me also
