How about another sequel to Pac Man, only now, he's a great grandpa, and he has to chew 10 times on each pellet before gobbling it. The special pills in the corners are meds for his arthritis, gout, and other old-people problems. The ghosts all walk with canes, and when they turn blue, Grampac (Grampa + Pac = Grampac) shakes his fist at them disapprovingly.
Oh, and the ghosts: The red one chasing you, will stop every few seconds to catch his breath. The blue one will have really bad eyesight, so he'll NEVER find you. Orange one will wander around the board over and over not remembering where he was going. Probably should even stop at intersections and look side to side like he doesn't know which path to choose. The Pink ghost will stay inside the center "room" and never come out. Whenever you move Pac close to the entry of that room, Pinky will shout "Who's there!?" and "Go away!"
I think this would be a great game.
I like this idea, some more suggestions to make it more fun, and less novelty.
Make it look just like the classic Pac-Man series, but make Pac a bit "gummy" because he lost his teeth.
As for the multichomp, Junior Pac-Man has some pellets that need to be double chomped, I say use that for the whole game, anything more would be frustrating.
Intermissions are definitely needed. All related to Pac and the Ghosts being really old now.
I think Granpac should be able to gobble at full speed if he has eaten a power pellet.
Every once in a while (maybe a 25 percent chance per screen), one of the ghosts should fall over and get stuck. Get someone who does a good Gilbert Gottfried impersonation to record some audio for this "I've fallen, and I can't get up."
I like the pink ghost idea, but I think it would be better if he did come out from time to time, but never ventured past the area directly around the ghost house (or just let Pac-Man enter the ghost house), there has to be some chance of eating him.
As for canes and such, I suggest mixing it up, one with a cane, one with a walker, one in a wheelchair, and one who moves normally.