Controls:

Steer house: [LEFT] and [RIGHT] cursor keys
Grab/throw bricks: [SPACE]
Call air strike: [SHIFT]
Brickopalypse: Hold [DOWN] cursor key
Advance level: [UP] cursor key (allows player to skip early, easy levels of the game up to level 20)
Pause game: [ESC]

Minigame controls:

Press [SHIFT] when the WHOPEE! bar is filled to access the minigame.
Use the cursor keys to move the princess.

View the PROTIPS (displayed while the game is paused) to find out more hidden techniques.