itch.io

there's some method, most likely getting it off the internet (even though simplest, it's not the safest, thanks to potential viruses), the other way is if you have experience with Godot itself, you can just decompile the game (you may wanna extract the svg from the pck itself since it's webp and you gotta convert it to svg) and make it mobile [there's actually a mobile controls that went unused, but you could make it used]. (not the simplest, but it's the safest)

I mean, for now, you can use wine to play the game, it works perfectly for me on linux

I think you can enable linux on your chromebook and install wine on it, it works with wine well. Let me know if i'm wrong.

The fact that BFDI Branches works perfectly on Wine (Wine 9.13-staging) makes this a good game for fellow linux people