Is the version here on Itch.io not the full version of the game ?
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Hello! Compared to the Steam version, it is almost full. In Steam version, there is short additional branch about another girl in the Ragnar's story :)
As far as I remember, you should be able to get free Steam key of the game if you bought it here.
Unfortunately, the game is not popular on itch.io compared to Steam version (it has literally one purchase on itch.io), so I haven't updated game here yet. Maybe I'll do this in the future.
For us, placing the paid game on itch.io was an experiment of some sort.