Simulation

In this simulation Game, you just watch what happens in a world where creatures have to follow strict rules to stay alive. They need to find food and get back home before the time runs out to survive and reproduce. If they don't do either, they die. There's a twist, though: rhombuses only eat circles. You can modify how much energy creatures use every second, based on how fast they are, how big they are, and how well they can sense things. You're like a spectator in this world, just watching what happens without controlling anything.

This idea is heavily inspired by the following YouTube video: