Grow procedurally generated monsters in a lab and then send them out into the world to create havoc using physics-based controls. That's the basic idea behind Test Tube Titans.
This game has been removed from Steam by the developer in protest of Valve's hands-off approach to dealing with toxic and hateful communities on this platform. Video games have fostered an extremely problematic sub-culture and it is this industry's responsibility to do everything it can to tackle this problem.
Test Tube Titans is available elsewhere if you would still like to play.