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 (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