Well, this was a thoroughly meh game. The story's lame. There's only a few scenes. There's barely any animations along with some defeat scenes attached to them. The combat is horribly repetitive. Hell, I can't really call this a proper side-scroller either, because you just really have one stage with repeated enemy waves and that's it. You don't have to GO anywhere or anything like that.
You have more stage variety in friggin' old Mario games from the age of cartridges...
I also don't see a point in trying to grinding after finishing the story. Dunno what "extra gameplay mode" they have at lvl 30, but I doubt it's worth the effort. Though if anyone could be assed to see what it is, lemme know, if only for the sake of vague curiosity. Assuming I don't just forget about this game by tomorrow. It was that lame.