I actually tested that out in the original Katamari. I got up to 3m and again 12 meters in make-the-moon eternal, and then each time knocked every visible object off of myself to see what the minimum size I could be was.
Some weird stuff happens. The game assumes you won't do this of course, and so because the ps2 ones had to do garbage cleanup on smaller items more aggressively, it sets you to a minimum size so that it can stream objects out and progressively larger ones in as the new areas open up. I think 3m65cm and 13m25cm were the smallest I could get my katamari down to.
With the 12cm one, it also has the odd effect of making you float around the level. There's an invisible hit area surrounding the katamari that's bigger than the model, which also explains in the earlier versions why you'd sometimes pick stuff up that appeared to be floating an inch from the ball.
I um...work from home and have a lot of time on my hands, heh.
Garry's mod is great. You can build all kinds of crazy stuff and even make weirdo
Rube Goldberg contraptions. Custom cameras, visual-effects, built in save-to-avi, levers, pulleys, ropes, working motors, stackables; people even use it to make
little movies , comic books, and
bizarre working machines with it...I love sandbox stuff. It takes a lot of patience, but I bet you'd dig it.