You have tiered bot models and AI.
Why not allow us to spawn in companion bots who target the enemy instead of the player? Maybe at the cost of 1 energy bar, maybe they're temporary and despawn between levels.
How we get companion bots of tier 1, 2, or 3 could be handled in the current upgrade tree.
Or we could earn higher tiers depending on the number and type of bots we slay.