Delver

Alpha funding! Early access, alphafunding, or paid-alpha is a funding model in the video game industry by which consumers can pay for a game in the early stages of development and obtain access to playable but unfinished versions of the game, while the developer is able to use those funds to continue work on the game.

Delver is a first person hack-and-slash game in development for Windows, Mac, Linux, and Android devices.

Minimum system requirements: 

A Java Runtime Environment