Enter these at any time during gameplay:

Change Screen: showz
Clear All Caches: clearc
CPU Controls You: robot
Delete Messages: purge
Display Codes: diags
Go to Windows: dload
God Mode: wimp
Infinite Lives: getalife
Return Game To Normal Speed: normal
Sensationally Serious Super Slow Motion: slowwww
Seriously Super Slow Motion: slowww
Show Created Files: report
Skip Current Level: goto
Slow Motion: slow
Super Slow Motion: sloww
Teleport the Nearest Centepede: pede
Toggle Collision Boxes: boxes
Toggle Flight Mode: fly
Toggle Time: times