Custom 2D Particle System

I am working on a custom 2d particle system for a game that uses the unity 2d collision system.

The particle system uses simple 2d sprites that are recycled so there is no instantiate "jerk" in the game. Every particle has a custom script with a coroutine that checks for collision( using raycast ) and applies different tweens (alpha,scale and movement)

Is this a correct way to do it? Ignoring the fact the number of particles present in the scene at a given instance..

The 3D Particle System does not supports 2d collisions. I also don't want to add a 3d collider to objects that have a 2d collider just for the sake of particle collision.