Looks and sounds really good! There's probably too much guess-and-check mirror tweaking, but on the other hand I do really like to see a "laser game" where you are routinely using reflection angles that aren't 45 degree increments. Also, and this may just be me, I was a little sad the laser wasn't dangerous and there was no nice 1-bit disintegration effect. Whatever you would have done would have looked and felt great.
I think you probably could have gotten away with a single contextual button and had slightly cleaner controls (just hold space + left/right to move mirrors, use space to enter doors, etc.) but its debatable and the ROI is limited. Hope you enjoyed your first jam, you started strong.