Zubo is first and foremost a Rhythm Action game, the RPG elements are minimalistic and for the most part inconsequential.
You collect (kind of like pokemon) and form a party out of little super-deformed characters based around pop-culture genre cliches (pirates, cowboys, aliens, robots, b-horror monsters, etc) and have them duke it out with various doppelgangers.
The basic roundup:
- The environments are quirky, bright and colorful, kind of like what you'd find in a kirby game;
- The music is upbeat and amusing, but somewhat limited in variety;
- The story is nonexistent -- "There's the Big Bad, you know the drill";
- The combat mechanic is very simplistic but fun and most fighting moves differ only in their tap sequence\visuals.
I suck at rhythm games, although I love them very much, but was able to do quite well in this game, at least until the tap sequence difficulty increased. So this may be a good introduction to the genre for those of us with rhythm deficiencies (like myself).
P.S.
I can't say there are many "better" games of this type, since I wouldn't categories it under "RPG", it's a simpler kind of rhythm game -- simple but enjoyable.