'collision with world bug'?
If by that you mean when you get stuck in tires after getting hit by a 'bot', then it's still not fixed. Not only that, but I've seen tons of games similer to this, AND THEY WORK BETTER. Keep up the work, but try and make it your own, and check the bugs yourself on perhaps multiple servers, and make sure they're completely gone before relesing it. Although, a few small bugs that won't hurt anybody that you constantly tweak into perfection are okay.