After playing all the levels, make your own in the level editor or create a toy in sandbox mode and share it on the community site for the game:

http://groups.google.com/
group/tile-factory

Hotkeys:

Shift-click to place multiple copies of the same part.

With Part in Hand:

WASD => Rotate to given direction
Space => Toggle power

Don't forget to click the bridge to see a preview for Tile Factory 2.