Thank you very much!
I really wanted to put the OutRunners' cars in the game, but I can't rip the sprites, sadly. And I don't want to use the Genesis sprites, because they are too low-res.
And I'm really glad that you like my game better than Slipstream! (I bought it as well, but I don't like the sluggish controls and how every corner feels the same.)
Indeed, I'd like to do the planned updates first and I'll do the Space Harrier thing someday.