This is a full-on Action MMO experience condensed into an SRB2 mod. ...I swear to God Lat' is some kind of wizard. How do people come up with these things?
Combat is fun and highly varied, if a bit rough around the edges in places (Ranger is a particular sticking point for me, having PP management issues that result in a lot of waiting around), but the real star of the show is the social aspect. Hopping into a server, gearing up, and rip-roaring through the campaign with a team is an absolute blast. Throw in a fully-functional emote system in the style of Symbol Arts, and you have yourself a fantastic way to burn an hour or three, either with friends or strangers.
My biggest complaint is that I want so much more of this, and that is a wonderful complaint to have.
I don't officially support the Android version as its specific quirks make it hard to maintain, sorry.