I have actually worked a good amount on this project, although it isn't much. There are two variations of the engine, the original and the 2nd variation. The 2nd variation is like the original but with a small wait between particle spawning. There is also a small ghost effect so it quickly fades into existence. Hover your mouse to the right side of the screen, and the UI should appear. By clicking the "Set mode to 1" button, you will enable the original engine. By clicking the "Set mode to 2" button, you will enable the 2nd variation. Have fun!
Don't forget to give credit if you use this! Everything by me. For the thumbnail and background, I just threw together some random shapes honestly... tell me what you think of it!