I played this a lot during my last semester's finals. There's also another game from the same guy: http://cursors.io/ ^^^ Collaborative puzzle game. http://voar.io/ ^^^ Orbit a planet without crashing game.
hit the spacebar. also, if you split yourself you can sometimes get away from bigger organisms because you get faster.
It's not the spacebar. It's the W button. Spacebar splits yourself in half to eat a smaller bubble, assuming your half is still bigger than your chase. W shoots small pellets of your mass. Sometimes you'll absorb them, other times you'll burst into smaller bits.
Ive been playing this over 2 weeks. Shooting at the neutral green circles makes them split. You can ise this tactic to force split the big ass ones. Also, if you're mexico other mexico friends will feed you to grow but its also like setting it on hard mode because nobody seems to like mexico.