I actually have a level tally for Sonic Dash, but it is a bit hackish in parts.
I'll try and put it in, and people can expand upon it, but if I can't I'll post the code here and someone Chronic can try and implement it.
Of course, it may already be in and Dark Raven could just not have seen the engine, so... I guess it may not be useful at all. I'll just take a poke around first.