Ecosystem Tank plays best in landscape. You get more tank, and every control fits on screen.
Build a food chain, then keep every tier alive against a rising tide of disasters.
Grow a food chain, then keep every tier alive as the disasters roll in. Outlast everyone.
Plankton feeds the small fish; they feed the hunters. Your score is how long the whole chain stays alive. Tap the water to drop food where it thins.