Had to downgrade to 4/5 when, after a few hours of playing, it froze.... and didn't autosave at any point. Even if the user doesn't use 'save and quit', the game really should at least let you continue at the last floor if something breaks.
My only complaint is the required accuracy--on my laptop, (1080p, 4" touchpad crosses 600px when I move slowly--acceleration makes it useable), single-pixel accuracy means getting my finger to within 6 thousanths of an inch, which is annoying. I would suggest a hotkey to snap the fold to a multiple of 45 degrees (or smaller, but something to make it so if you know to fold a specific angle, you can actually acchieve that angle).
Loved the game concept, but I also have issues with manipulation. I would have liked to see either the ability to bind a pair of pieces together (edge to edge) to form a larger piece, or (not as preferred) the ability to nail a piece down to keep it from getting pushed around. This is a puzzle game, which means that once I figure out the solution, it should be as easy as possible for me to actually *do* the solution.
It would be nice if either some of the research requirements were higher, or required later. I spent the entire game pushing against my heat-floor, and mostly played ice planets so I could go deep enough to tech-up.
Would be nice if the hit-boxes on a few things were a bit smaller. I'm not positive if it was me messing up and slipping off, but I swear that on the last level I kept getting electrocuted while standing on the (edge) of the block that the horizontal beam was on. Overall quite good though.