I downloaded this yesterday and I'm honestly floored. Amazingly sharp visuals, fantastic mechanics (drone, warping, upgradeable guns) and some great music make this game an instant classic in my book. Honestly, I would buy the soundtrack alone is worth the price of admission.
I've been playing as Ruby with type B weapons and just made it to the third boss. I got my ass handed to me, but this game is so good I can't wait to get back in and see the next level.
Anyone who loves horizontal shmups and doesn't own this really owes it to themselves to download Omega Five.