You can download the Arbiter Pre-Alpha Demo for free from itch.io! The demo is a polished, fully playable tutorial level that will most likely appear in the final game. It’s about 15-20m long, filled with various enemy encounters and a boss at the end. The game is currently only supported on Windows (PC).
It is recommended that you play the game with a controller, as tutorials are currently only fit to work with Xbox Controllers. That being said, the game can be played perfectly fine on PC (you just won’t get any tutorials for it).