NOEDIT:
if you read the syntax errors you would've noticed that you are missing a semi colon at the end of jumpSufaceAngle = 35, you put a semi colon on the end of if(%slot == 4 &&%val == 0); which shouldn't be there.
Also, the jet thing will still be working, even after the player dies or changes datablock. And that jet thing makes you go at uncontrollable speeds, ask coding help for help with this.