Oh dam, you're the first one I've heard that ran the game on Chromebook. The Switch Pro or PS4 Controllers should have worked, as we use a generic controller template for mapping the controls. Unfortunately, we lack a Chromebook to test that. It is most likely an issue with the library we use for mapping controls, Rewired on Chromebook, but again, we can hardly test that :s
Still, I'm glad keyboard and mouse worked for you, and that you liked the game ! :)