It's Roblox Brave Order. And it's actually fun for a bit. You get guns and you have to kill monsters on each stage and then after you kill them you can advance to the next stage. And then there's bosses every 50 levels and you can upgrade your guns and get pets and mounts and die to LAG GLITCHES HACKS!
play: https://www.roblox.com/games/13623909...