Thank you for testing GreenEye. To get this to run you'll need to follow some extra steps.
Download assets here: https://1drv.ms/u/s!AoJn9zos46UqpRRqJkcYAT87X0gw?e=TFPGdM
Open this project with a custom build of Godot: https://github.com/mxmstr/godot/releases/tag/3.5
This project is designed for controllers, but there are some basic keyboard controls for debugging purposes. You can view the keybindings in Project -> Project Settings -> Input Map. The keyboard always controls player 1. You'll need to plug in extra controllers to control the other players.