Nice simple game. Makes me wanna play Spore, but I know I'll get bored after the cell stage, and this is basically the cell stage, haha!

Nicely done!  The concept is cool, the behavior of the siblings is interesting, and the gameplay is very interactive, requiring a bit of planning ahead and escape maneuvers in order to "win" (or at least break even).  I like to think that every time you win you're not actually shrinking, but competing with equally massive beings from a further zoomed out perspective.

I really like how the siblings are dynamic and will choose to chase down smaller siblings or run away from bigger ones, but I noticed in the early stages that "dances of death" would regularly happen, where two equally sized siblings will pair up and endlessly circle each other.  I had a game where every sibling paired up like that, leaving me free to eat the entire board unopposed.  Perhaps a bit of randomness in their behavior would help with that?