Hey, hey!
I joined up just to congratulate you on Sonic Axiom. It's great all around! I am truly in love with the level themes you used--they're the best I've seen for any Sonic game, let alone any fangame. The choice of music for most of the regular levels are well done.
(Speaking of, though, I don't have a shot in hell in figuring out where the music is. Some of these artists have tons of music, how the hell am I going to sort through them? Do the songs have original titles? Following Axiom got me nothing.)
One thing though: I think the bosses need polish. A lot of them feel clunky, either easily stuck in waiting game patterns or too easy period. And sorry, but the regular boss theme is horrible.
There were a couple of glitches, such as wandering right into geometry, but they were few and far in between. Do I not have the latest version though? Some people talk of being able to partially charge the super peel out, but Sonic will stop unless he's in the max speed animation for more than a quarter second.
Still, though, the level design is beautiful and HUGE. Some of those later stages took me upwards of 4-5 minutes, and I was rushing through them, too. I rather enjoyed the experience--and I need to go beat it as Knuckles.