Very original idea! I was telling myself how smart it was to have an horizontal stretch to take the kind of elevators. Music wasn't bad, but a bit repetitive. The gameplay was good, a bit hard to use the strech using the mouse. You could add something to tell the player in which stretch mode they are. Good work!
Yeah, the music was done in a bit of a rush; I was thinking it might be extended by about sixty seconds to reduce the redundancy. However, I had to prioritize!
I think it might be nice to have some kind of a HUD symbol for the module being used. Somewhere like the top-right of the screen, maybe. It would make it a bit less confusing, right?