I must say that I love this game. Battle against time and your own height is a very clever and innovative mechanic.
I have some ideas that I would like to see in game:
-crouch button - sometimes it's hard to see what's inside bottom cabinets at start of game when you're still big
-sandbox mode - with ability to change your height at will with +/- buttons and maybe fly button to experiment with laboratory and possibilities at lab at different sizes
-growth problem - basically mirrored version of main mode when you start as short person that starts to grow and must create antidote before growing too big
-machine creating random potions each 30 seconds for custom mode with effects being like: faster/slower movement, higher/lower jump, slower/quicker shrinking, rentgen vision (to see where potions are hidden), blurry (drunk) vision etc.