EatOrbs are ETH. Sharks with a green ring and EAT are yours: sprint and swim into them.
RunAnything 15% richer than you swallows you whole. Red ring and DANGER: swim away.
Cash outHold C for 5 seconds and leave with what you carry.
Point at the water and your shark swims there (the gold ring shows where). A and D also turn it. Hold the mouse button or Space to sprint. The radar shows what is behind you: red can eat you, green is food.