Considering that several versions of the game have very different setups in terms of how they run, levels, etc.. would it be appropriate to have additional categories for those older versions?

0.6.x were pretty much just prototypes of 0.7 so i don't see why anyone would run them, 0.2 is broken as hell, and 0.3 is 95% identical to 0.4 (same amount of stars). so i think 0.4 would therefore be the only category aside from 0.7 and 1.0 (maybe 0.9 too)