Need help with new game

I’m planning to make a game where you can upgrade your vehicle, but I have yet to learn how to make a shop and apply ‘bought upgrades’ to my vehicle.

Also, I’m also trying to make it so that the vehicle can rotate but only in mid-air.

I’m also experiencing some problems, such as my vehicle is hovering and the rotation cause by the stairs keeps going if you hold down gas (right).

Here’s my game link http://www.flowlab.io/game/play/215516 (Still in basic stage)

well… first things first. change the sprite shape from circle to rectangle, and add a collition that sets the rotation to 0, and use the attach feature to make costumes to the car