I want the rocket to rise when holding the space key in the game, but I couldn’t.
released means the key is not pressed anymore.
Replace with key is pressed.
It only bounces 1 time and after it touches the ground again, it can jump again 
Hi maybe you can add a condition rocket is on floor, that is for the very first jump, then remove the jumping condition and add rocket is moving, with that you ensure the rocket is jumping or falling.
Add one sequence of events to jump for the first time
Conditions:
rocket is on floor
Space is pressed
Action: simulate jump
Second event
Condition:
Advanced OR:
– rocket is moving
– rocket is falling
– rocket is jumping
out of the OR
Space pressed or released as you like
Actions:
Allow rocket jump again
Oops, you also need the action Allow player to jump again.