By the way, the minimum size to launch bits of mass from yourself (with the 'w' key) is 32 mass.
If you stay small, you can zip around grabbing pellets, and when you achieve 32 mass inject that into spinners. Make a nice little spinner forest for yourself, and so long as nobody recognizes the immunity quality and gobbles them all up (or nobody can do so safely without risk to themselves/they're not dense enough to make it worth it), you're good. You're not going to get first place doing that, but if there are a smattering of spinners across one area, it could fall into disuse by larger blobs, and create a nice little nursery cubby.
Also, you can make an interesting game of luring fools to their deaths by hovering around larger blobs, or feed the blobs; sponsor your favorite giant! Or, better yet, wait for a chase between two roughly equally sized blobs, and inject mass into the smaller one. If you gauge it right, meaning you had enough mass on yourself as well, you can increase the mass of the prey by enough that the hunter ends up being absorbed. Or slow the prey's velocity at the worst possible moment and get them eaten.
The game needs to count survival time as well as highest mass. I'm too lazy to actually find my stopwatch app on my phone.