On the non-experimental version you will need to exclusively use the mouse to navigate the menu system. The new version is designed to use mouse or controller. When navigating the menu in the experimental version is the nagivation red for the most part? I've ran into some issues if you try to do most of the navigation with players 2 (blue) ,3 (green), and 4(yellow). ( One of the things I was going to fix before this release but I wanted people to be able to play because of the cronavirus. )
Oh I forgot to mention that the experimental build doesn't have any built in levels or campaigns... So you have to build a campaign and level to try it out.
Also thanks for your input. I'll work on fixing some of this tonight if I get a chance.