It could be a scaled graph. I would suspect that The End of the Wonderful World might have less people who have bought it, so the # of cpu cycles that it generates scales higher, than say SMB which many people have bought so you need more cpu cycles to get it to go higher on a relative scale. despite having more actual CPUs allocated.
Course this assumes that those scales even MEAN anything!
I doubt I'll buy the Potato sack pack. I have about 30% of the games. Though I admit Cogs looks really really interesting....
Also is Bit.trip.beat supposed to be this hard?!!? I thought I was pretty good at these rythm games but that one is just killing me even on easy.