In this game, run away from the suicide spheres while dodging and counterattacking the triangles.
I can see a little bit of what you wanted to do. While both use basic NavigationAgent, one goes for the chase and eventually explodes while the other enters its attack pattern when getting in range. It makes the game interesting enough to go through the levels that you do have.
I feel that you've suffered from having no support. A very supportive group is around on Discord, and I think teaming up will help you grow your skills.