Can someone tell me why my jetpack isn't working?

Go to Forge to test it. Additionally, please let me know if this game is allowed on flowlab.

Yes, it’s allowed on Flowlab
Also, you should name it Halo: Combat Devolved because it’s a 2D halo game

Force isn’t applied to attached objects

ok, but why is that though?

It isn’t meant to be a 2D remake