This has genuinely good mechanics and LOVING the artstyle too !
The only bad thing about this is that the "evil" ghost has too little significance than the "good" ghosts. It's just too subtle to look for (imho).
Also, the timer seems to be too fast for me to arrange my targets (debateable). Probably add 1 second to the rule ? Because sometimes the ghosts clumped up together and made me had to wait a while to pick the correct one out.