I love interactive particle/line apps and this is the best I've found. I have many others with titles containing works like particles, lines, linear, laser, fireworks, lightning, gravity, plasma, fluid, toy, and yes the weird names too.
This app has flexibility and depth. To start, it has a wide variety of precanned configurations to choose from. You can modify these, or start from scratch, and then store them as your own interactive creations. Nice!
The emitters and fields, a great concept, are fully configurable and a lot of fun. Many many other configurable items too. Help screens clearly explain options. Pure eye candy in a huge variety of forms.
Nope, I have no connection to the developer. (I often wonder that when reading reviews)
Only enhancement I'd like is an option for more than 100,000 particles. Ok, true, that's a lot, and more than most others offer. But with current cell phone processing power, why not!