Very well done
It's clear a lot of work went into this one. A mixture of DDR and Tower Defense games, this game features great music, sleek graphics and an intuitive interface.
I liked the playfield/towers/etc, that they were well designed enough to be able to "read" what's happening at a glance. For example, towers are color-coded by type, and shape-coded by upgrade level. When a hundred things are happening at once, this is very useful.
The gameplay is fast-paced and fun, and does a great job of combining the Rhythm Genre with the Tower Defense genre. Playing it reminded me of the first time I played Dance Dance Revolution way back when. Except this time it didn't involve me sweating, panting and making an ass of myself in public.