Escape from the lair of Professor McSteen, using his shrinking machines!
If you get stuck, there are tips on the Help page in game, but I suggest you attempt the game first before reading the tips, as they contain spoilers.
This game was made for Ludum Dare 23, and you can find the entry at http://www.ludumdare.com/compo/ludum-dare-23/?action=preview&uid=8756. The source (and a Windows version) can be found here.
Controls: Arrow keys to move/jump. WASD if you prefer. Use the mouse to click on blocks next to you to pick them up, then click on a space next to you to place them.