One particle per enemy for MANY enemies

[josemendez]

I was thinking of using one particle per enemy.

I thought I would use Obi because I suspect it's more efficient than Unity's physics engine, and I would like to have a lot of enemies.  

Hi,

Using Obi for this is probably going to make things overly complicated, as it is specifically optimized to be a particle system and it does not contemplate custom character rendering or logic.

My advice would be to use Unity's DOTS, its built on the same technology Obi is (Jobs + Burst) plus an ECS paradigm and it is designed specifically for use cases similar to yours:
https://unity.com/dots

kind regards,