Particle Engine - suggestions for use?

I have created this little particle engine :

ParticleEngine2D

It is no near perfect. For one thing, the springs add problems with the collision handling. But it is good enough to show usage.

Does anyone have good ideas for improvements and/or usage? Is it a game or something else? I'd like to hear your reactions.

NB: The app runs on AmigaOS 4, but I cannot capture video there at the moment.

At github.com

@alfkil

The very first thing that immidiately crossed my mind watching it, is some kind of planetary/gravitational system simulation.

e.g. the solar system
- add a massive mass in the center
- add some more smaller masses around it
- add gravitational push and pull
-add trajectory speed to the smaller masses
-add circular speed to all the masses
-add random events, like tiny masses entering your system (comets)
etc.
too many ideas in my head for now

@alfkil
Atom simulation program with educational purposes.