noble chasm
Addtime <x> adds/subtracts x amount of time in time based mission and addlives <x> adds/subtracts amount of lives in lives based mission.
Also when the time runs out, instead of simple game over text, it would be better to trigger an event called timeout which could be used for random conditions.
For example:
Fuel runs out (if sethealth worked on self, that's why we need a player event) or of other objects
A damaged object explodes.
Triggering a failure event (like nuke launched/swarm of drones active)
Lots of possibilities.