Ahh, yes! Sorry! >.<;
To ride the Jetpack, you need to press the Space bar when you’re near it.
To power it up, you will need to toggle to the keys by pressing Q. You will see a (Godot Feature texture lol) on top of the PC head. Use your mouse to turn the wheel to power up the Jetpack, just like you opened the door.
Ahh, I forgot to mention. You must hold down the space bar to hold on and use WASD to move.
Also, you mentioned the Jetpack disappeared. You might have picked it up. By pressing E you can pick up the Jetpack. Toggle the Keys/Tools button (Q) to get to the tools options. You should see the jetpack available for deployment by pressing 1.
