Confusing at first but then I got it: you have to move the background pieces in a certain order for the tear to become a door. This can become a bit tedious when you have 6 pieces.
Glitches: backgrounds can either become stuck or stacked and they won't come apart. (seems we should avoid moving the backgrounds diagonally?) Hopefully there's R to fix/restart.
The shooting ennemie is a nice addition, one can bounce the bullet and make him kill himself.
Still the idea is nice, the graphics look nice (except for the blond woman(?)) I managed to level 6, with a lot of restarts (mostly due to the glitches).