when the Infected Laser Ball kills you and you retry the game, the game crashed. This happened because of a contradictory condition in the Air Striker.

There is an event which will toggle other events by conditions.

one of the toggled events was the jetpack function and in the trigger event it said (if key "Up Arrow" is not pressed) and you have to press the Up Arrow to fly.

I fixed this bug by deleting that condition.