So, I decompiled Fez, cause it's written in .NET, which is reallllly easy to reverse-engineer. It's not illegal, as reverse-engineering for any purpose other than directly to circumvent DRM is not actually clearly defined in law ^^; I don't think I can distribute the source, but I should be able to find interesting bugs/cool things by debugging the game as it's run

So, here is a list of all possible actions Gomez can perform

None,
Idle,
LookingLeft,
LookingRight,
LookingUp,
LookingDown,
Walking,
Running,
Jumping,
FrontClimbingLadder,
BackClimbingLadder,
SideClimbingLadder,
CarryIdle,
CarryWalk,
CarryJump,
CarrySlide,
CarryEnter,
CarryHeavyIdle,
CarryHeavyWalk,
CarryHeavyJump,
CarryHeavySlide,
CarryHeavyEnter,
DropTrile,
DropHeavyTrile,
Throwing,
ThrowingHeavy,
Lifting,
LiftingHeavy,
Dying,
Suffering,
Falling,
Bouncing,
Flying,
Dropping,
Sliding,
Landing,
ReadingSign,
FreeFalling,
CollectingFez,
Victory,
EnteringDoor,
Grabbing,
Pushing,
SuckedIn,
FrontClimbingVine,
FrontClimbingVineSideways,
SideClimbingVine,
BackClimbingVine,
BackClimbingVineSideways,
WakingUp,
OpeningTreasure,
OpeningDoor,
WalkingTo,
Treading,
Swimming,
Sinking,
Teetering,
HurtSwim,
EnteringTunnel,
PushingPivot,
EnterDoorSpin,
EnterDoorSpinCarry,
EnterDoorSpinCarryHeavy,
EnterTunnelCarry,
EnterTunnelCarryHeavy,
RunTurnAround,
FindingTreasure,
IdlePlay,
IdleSleep,
IdleLookAround,
PullUpCornerLedge,
LowerToCornerLedge,
GrabCornerLedge,
GrabLedgeFront,
GrabLedgeBack,
PullUpFront,
PullUpBack,
LowerToLedge,
ShimmyFront,
ShimmyBack,
ToCornerFront,
ToCornerBack,
FromCornerBack,
IdleToClimb,
IdleToFrontClimb,
IdleToSideClimb,
JumpToClimb,
JumpToSideClimb,
ClimbOverLadder,
GrabTombstone,
PivotTombstone,
LetGoOfTombstone,
EnteringPipe,
ExitDoor,
ExitDoorCarry,
ExitDoorCarryHeavy,
LesserWarp,
GateWarp,
SleepWake,
ReadTurnAround,
EndReadTurnAround,
TurnToBell,
HitBell,
TurnAwayFromBell,
CrushHorizontal,
CrushVertical,
DrumsIdle,
DrumsCrash,
DrumsTom,
DrumsTom2,
DrumsToss,
DrumsTwirl,
DrumsHiHat,
VictoryForever,
Floating,
Standing,
StandWinking,
IdleYawn

VictoryForever?

We know... I know of 2 people who have written mods for FEZ (clearly requires decompiling), and probably more have looked at it. It is nothing special, and probably happens to just about every game. Personally, I have looked into the code quite a lot and have not found anything usable by runners. But you can delay setting reset points in specific situations (f.e. go through a room to collect bits, and then die to re spawn at the door.) But by all means, try to find new glitches

Ah well. I'll tell you if I find anything interesting :)