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Hello took the game here. Overall good! Is it possible to somehow get the key in steam?

The game is not released on Steam yet, and will have to be purchased there once out (ETA Q1 2019). 
The itch version is free to download though, and is to be considered like a demo.

Make sure to join our Discord, it's free and the best place to stay up to date on development and people to play withhttps://discord.gg/Gc4z47m

Best regards, 
Akitake - Beta tester, Subreddit Manager, Discord Moderator