StarForge is quite the thing. Fire it up and you think it's a shooter. Run around and you find there's nothing to shoot. Go to switch weapons and...oh. Oh.
See, StarForge isn't really a shooter. It's a shooting sandbox. You're dropped in a randomly-generated world with not just a gun, but an invisible space shovel that lets you alter the terrain around you. You've also got an invisible space forklift and toolbox, letting you lay down various crates and construction materials, as well as the ability to magically generate turrets and spinning death traps.