The particles in this simulation move like an hybrid of regular atoms and quarks. Actual quark behaviour as theorized now is too complex to simulate and would be too unusal for us to enjoy. So it is simplified in lots of ways. Two ways this simulation resembles quark behaviour is that particles have a constant force bond between them, unlike atoms where force diminishes with distance and new paticles are formed when enough energy is stored, which is very weird from a human point of view. It is like streching a rubber band and getting two rubber bands of the same size as the initial one. Yes, quarks act in weird ways, world in quantum scale is weird, we hope this will excite you.