NOCLIP Command should get you free, otherwise RELOAD Command should reload the last Scene... Hope that helps...

I got stuck in a wall, hope this doesn't happen much as i just bought it. any command to restart checkpoint or die without losing any progress? I'd hate to use purge

Also without the console, these cheats work
TOKFA - gives everything including keys
TOMISS - unlimited micromissiles

Thank You!
Recently the Dev posted some more Commands in the Discussion Forums:

maxfps - sets max fps
slomo [n] - slows the game down
setshells [n] - sets shell count
setbullets [n] - sets bullets
setheavy [n] - sets heavy bullets
setrockets [n] - sets rockets
setplasma [n] - sets plasma
sethealth [n] - set health
zhenme [n] - gives money
zerowave - debugger for horde mode (not sure what it does)
reload - reload last scene
goboom - destroy all destructables
noclip
spawncount - get spawn count
purge - end level
instagib - sets instagib
fastturbo
notrigger
kill
trailermouse
tornado
god
skill
skill0 - sets skill
skill1 - sets skill
skill2 - sets skill
skill3 - sets skill
hidehud
giveall
givekeys
forcelastcheckpoint
neverrunout
cinecam
notarget
getlastweaponindex
debugflamer
toggletoken - toggles token system on ai
mech - go in mech
armor1
armor2
killwave - horde controller, kill enemies in wave
fog

You an also type "God" for God mode.