lol, Sounds like fun! But let's put it this way: if Osmos is a challenging in 2D, imagine how challenging it would be in 3D!
Put another way: spaceflight is hard! Trying to control a fully 3D momentum makes your head spin (literally!) Without computers and tightly controlled flight plans, it's basically impossible for humans, because our intuition doesn't apply to a fully 3D angular momentum. Ahh, math.