I really enjoyed that! The music really added to the pressure! I found it was a bit too hard to hit any of the particles on purpose, and that I was just generally steering in their direction during my gameplay. I would consider adding some sort of slight "magnetism" attracting nearby particles towards the player, in order to push near misses into the player's favor and make the game feel more skill based.
I loved the unconventional controls, and I feel like it would fit well on a smart device or anything with a touch screen!
I encountered an issue with the UI where it was too big on screen when the game was not maximized, which is caused by Unity's default canvas scaling. If you're interested in fixing it, look into setting your canvas to "Scale with screen size" as opposed to constant pixel size.
Very fun overall though!