The music was actually composed for this game by TurtleBox! I remembered to include a credit on gd.games but was in a real rush by the time I got around to writing the Itch description and neglected to add it here as well. The SFX was largely just grabbed from Pixabay but took a bit of work. The engine noise in particular has a few different elements: whenever you accelerate there's an initial rev followed by a looping "engine running" noise, plus a steady "idling" loop running in the background. (Realistically the running/idle sounds shouldn't be heard simultaneously, but actually switching between them in the game sounded weird for some reason.)
It would be great to expand this into a more complete game: in particular I'd love to include local multiplayer. The two-button control scheme would make it really easy to let a bunch of people simply crowd around the same keyboard, or to have two players using a single controller (or four players using two). I can imagine using shoulder buttons to accelerate and face buttons to steer, with one person essentially playing left-handed and the other right-handed. Multiple tracks are a great shout as well: I was originally hoping to do that for the jam version, but it took a surprisingly long time to design just the one!