I feel the same way! I've been watching this game since its Kickstarter and I'm sad that I can't play it because I only have a Chromebook.
My only suggestion is to not buy a chromebook until the chrome OS is capable of doing anything, but I guess it's too late for y'all. I have a chromebook, too, but I'm lucky enough to also have a hand-me-down laptop from my sister as well. Chromebooks can run games like this if you essentially break them into making them run another OS, but I do believe that risks bricking the thing entirely.