Minecraft with guns. And not a rip off of Minecraft.

Doom/Quake/Goldeneye (take your pick) style games are awesome. But when you play, don't you just wish that you were designing the levels? Me neither, but Blowfish Studios thinks otherwise. They made an awesome game called Gunscape, and are currently Kickstarting it. And now that I think about what you could do with that, I whole heartedly think you should to.

The creator is based on themes, which are sets of assets like NPCs and blocks. For example, there's your classic sci-fi and stuff, but there's also things like classic doom and I think in the trailer I even saw a western! Anyway, with this themes (which you can combine), you can make anything from co-op campaigns to huge team on team fire fights with buttons that release dinosaurs onto your opponents. Rawr.