What the developers have to say:
“Nekro is a fully-functional game currently in Beta. We worked very hard to make Nekro a polished and solid experience, however bugs and unfinished features are to be expected. We encourage you to participate in Nekro’s open Beta if you are aware that the game is not finished. While the game is feature complete, it is currently lacking end-game content.

Early Access means giving you, the player, a chance to involve yourself in the production of Nekro. Currently, the game has 8 playable levels and lots of room for replayability through different builds and customization. Come join our community and share the experience of developing Nekro with us!