I just held the stylus while playing.
If you liked VJ1 for its deep, enjoyable combat, then I would give a hesitant recommendation at best for VJ: DS. The combat is stripped HORRIBLY in this one, so that your best bet for nearly every enemy is to just run up and punch them until they die. Slow combos are GONE, and the new powers are more gimmick than good combat tools.
However, those new powers can make for some not that bad platforming. Plus, the music and the presentation can make the entire affair enjoyable. The boss battles are nothing to write home about, but they bring enough to the table that they hold up their end of the worlds. In the end, I'd say go for it: the game is worth that price and not that much more.