my only question is I'm not sure how to beat these enemies. Are they press any key? If not how do I tell which key press https://imgur.com/a/mzddf71
Also perfects sometimes gives minus points? Why?
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Those guys and their little followers can be hit by any attack, it's just about timing for them.
The + or - symbols next to your perfects don't effect your score, they just tell you how close you got to an absolute perfect hit. + means you hit it late, - means early. There's nothing special for getting a +0.00 perfect though, so don't fret too much about it.