I like how they're offering a Mac version as the biggest incentive for donations. Shrewd indeed.
I actually feel this makes sense. Considering all the special work they're putting into the game's engine and such to advance the features, adapting it to Mac would probably be a massive pain in the ass. At the very least, a bit more difficult than moving an unmodified Havok engine'd game over.
Will there be missions? There should be missions. Are there already? Hm.
That's what he promises for the final game. Currently, there isn't much to do but test the vehicles, but it's still amusing.