Oh boy, where do I even begin with this mod? This is simply one of THE best SRB2 mods I've ever played, period.
I'm a sucker for anything Metroid, especially Metroid Prime, and this mod is a beautiful hybrid of both the 2D Metroid and Metroid Prime gameplay formulas.
The core gameplay is just as amazing as the 2.1 version, made even better by 2.2's better level design and new engine features, the revamped bosses are amazing, the new art is amazing, the new levels and bosses are amazing, simply put, everything about this mod is amazing.
I've played the campaign on both the normal and Hypermode difficulty's, Hypermode definitely spiced things up, though it shared the same flaw as hard mode in the Metroid Prime games, the bosses are bullet sponges, especially the final boss, it took me nearly 15 minutes to beat it.
I also experienced some performance issues with a few of the Beam Combo's, and the secret weapon, they would drop the game to single-digit framerates until the effects were off-screen.
But other than those two issues, you have exceeded my expectations with this update Shine.