Real engineering simulation with any projectile, any target, any material. Test Fire is an armor penetration sandbox with a campaign of engineering challenges and an open sandbox editor for making (and breaking!) whatever you want.
First-person precision platformer — A vertigo-inducing journey set in a brutalist facility of oppressing concrete shafts, industrial machinery and damp liminal spaces, that feel too large to be built for people.
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.