Smaller cells are faster, so division will help you outrun a big attacker if you're totally cornered.

Doesn't work for me. Is there a threshold for dividing? OTOH, the game is choppy as hell for me, maybe that's the reason.

I have Vimperator for Firefox, and I had to ignore those keys (Shift + Esc) while playing in order to use the keyboard. Just FYI in case anyone else ran into the same thing.

I think you can't divide if you have 16 cells.

If you have 16 cells, your big ones can also eat the green things and grow, instead of getting split up.

Is it possible to merge back in to one? Can you 'eat' yourself?

Yes, though I'm still not sure what triggers it.

You just need to feed one of the parts to be big enough to swallow the smaller parts, and then you can remerge after you pass the threshold

I'm pretty sure it's a timer. Cells cannot merge for X seconds after splitting, but after that any two cells that have passed the threshold can be merged.