Bought it the other day. It is very fun but I have gotten a little lost once or twice when things really speed up and get hectic.
My first 5 minute game got tense at the end when I was trying to do it without dying and had 30+ ghosts as well as the usual 4 chasing me down at a very high speed in the last few seconds. The onscreen countdown from 10 and the music sort of added to it for me.
This is my favourite BGM in the game. Especially love the end part that remixes the "intermission" music.
Just two more achievements to get.