Pleasantly Surprised.
When i first started i thought "oh great, yet another slow boring defence game"
Then out of nowhere, they start moving faster and kinda dancing and its so darn sexy you cant help but wanna start dancing too... well not really, but you get my drift
Anyways, great job, only recomendation i would make is making the powerups a little bit easier to pick up, i found it difficult to hit them often.