Bug?
I don't know how you can tell the levels, but at score 2673, no more icons came to attack. I still have 92 health, which i lost to the first boss (what i imagined to be a boss).
A little simple (as in not complicated/over in-depth game). The display could use a little tweaking to make it a little bit more eye-pleasing. I enjoyed the new enemies and such.
I never came across any healing items, although there were whistles, those always came at a timely occasion.