I must admit. I expected something more solid. This is really an engine, and not a game. Anyway, perhaps its code can be educational for me. Then again, it's not commented. Hrm.
Perhaps I should write an article about this, entitled «Why you should comment your code?»
And KW, you should really specify in details the gfx you need. Like the resolution you'll work in (the default one), sizes of main game sprites (preferred), what are they (cars, track tiles, etc.), how they should look, how many of them, image file format you prefer, graphics style, etc. You really can’t expect for people to do bunch of different things and then incorporate that into a single coherent game. Then again, I did notice that graphical design is low on your list of game dev priorities. Well, at least when it comes to Orb and UnAlien. And I'm presonally more motivated to work for someone else when I have specific requirements layed out.