Jetpack thrust not using physics

Is it possible to create a jetpack type thrust without using physics?

For sure

Just make your own physic system, using variables and conditions.

You'll also need to simulate a gravity system, if you want make it look like a real jet pack game, or, if it's on space, acceleration and deceleration, because space don't have gravity and if you get an impulse, (an acceleration for a limited time), you'll keep the final speed after the impulse depleting.

It's a simple platform game using thrust instead of jump, what would the simplest method be? I tried combining physics with platform behaviour but the player fell all over the place!

You could gradually subtract from the y velocity of the platform behavior.

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Make sure to don't miss Delta Time, it's essential for any animation show smoothly.

Another thing, you can still using Platform behavior and pin a physic behavior on him, using it to check collisions, etc.

A simple Jump behavior need to have 3 stages, is jumping, jump peak, is falling.

A simple jumping player will need simulate controls for left, right, and the jump behavior.