Don't let the 'early access' tag scare you away; Nuclear Throne is well worth picking up now, and the constant updates feel more like free content packs than they do updates to a work-in-progress.
Nuclear Throne is a tough-as-hell roguelike-like in the vein of Binding of Isaac; an overhead shooter blending fast-paced challenging action with RPG elements and random levels/progression. Different characters (more still being added), randomly generated levels and random mutations as you progress make each playthrough different, and allow you to experiment with different playstyles, though there are different 'areas' that keep consistent style over the course of a few levels.
Just to give you an idea of how different each game can be/how awesome the designs are, these are the current mutants you can play as:
-Fish, who gets more ammo than the other characters, and can use his roll to dodge bullets.
-Crystal, who has more health than the others, and can become an invulnerable shield which deflects bullts.
-Eyes, who can see in the dark and can use his telekinetic powers to pull enemies toward him and push projectiles away.
-Melting, a skeleton with melted flesh hanging off, has the lowest HP, but mutates faster and can blow up corpses.
-Plant, a sentient plant that can move faster than the others, and snare enemies with his roots.
-Y.V., a weird looking illuminati pyramid with an eyeball, can shoot faster than the others, and use his ablility to shoot twice with one pull of the trigger.
-Steroids, a beefed up dude that starts with two fully loaded pistols and the ability to use both of the weapons he can carry at once.
-Robot, who can find better weapons, and recycle found items into ammo for another weapon he carries, or health.
-Chicken, the newest addition and my new favorite; a mutant chicken that starts wielding a katana and can slow down time. Chicken's other ability allows her to live a few seconds after death, and gives you a little time to go berserk, a headless chicken with a katana, hacking frantically, hoping for a health drop to bring her back from death.
The designs are creative and fun, the art is great, the music and sounds keep things frantic and intense, the gameplay is solid, and most important of all, it's incredibly fun. This is one of the best games to come out this year, and if it looks interesting to you, grab it right now.
The throne definitely exists.