It is possible and like you said, Android has similarities with it but I believe it's not the same because Android is derived from the Linux system but it isn't something that works two ways; so creating a Linux build would probably be a different "project" per say and since there probably aren't a lot of users with Linux based OS, I doubt they'll release a build for it in Steam.
Great ideia! I use Linux Mint, and have to reset my computer to open windows and play cubic castles. I dont like playing it in android. It wouldnt be hard to do a Linux version, since there is the android version, and android is also Linux.
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Besides, last time I checked I could play it through Wine. Though the lighting and fog would make it a tad unplayable.