(EDIT) - I thought you were talking about 3D!
Disregard my post and pay attention to what @kdgalla posted below me… that’s what you need.
Steps to success (For a 3D jetpack game):
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find a good 3D player controller script (see below)
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turn off gravity (whatever that means for the controller script you use)
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put a particle system on the back of the player
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add in controls for climb / descend, (whatever that means for the controller script you use)
Youtube has thousands of viable 3D player controller setups… that’s always a place to start. Alternately you can try this one, but it is currently wired up to be first person, which may not be what you’re after: