I hope the developer will add the linux support....if not I'll understand...he's alone and probably it's not so easy to maintain both. Anyway, if it should be done...it will be really appreciated.
I've bought the Steam version both to support the dev and also because I suspected that Steam for linux could be able to run Tree-it...so I've bought it and it start it without any hassle... now I'll try it checking that everything seems ok. It's not the best solution, but if it works, it could be enough for me.