Calum is a John Carmack -level coding-wizard. The smooth, bugless experience came at the cost of us having to leave out a lot of stuff that we originally wanted to implement into the game, but in retrospect I'm glad we did instead of half-assing and shoehorning in complicated features that would have more than likely broken without the help of a second coder. Calum was able to do a lot and in a reasonable timeframe considering he had the Herculean-effort of doing all of this by himself, he's one of the most reliable programmers I've ever had the hounour of meeting ~
I'm glad you noticed that Bravesun has essentially created two versions of almost every track in the game! ^_^ It was nice attention-to-detail that helps to really spice up the game in a special way ~