For some reason I had to manually approve this (and a few other comments), so I am dreadfully late to replying to this! I'm so sorry!!!
The full game will be free so there will be no need to worry about buying it. I will look into the process of getting it on Steam, but that will most likely have to wait until development is complete. I'm a little unsure about it at this point in time.
And thank you for your kind words on the game! There will be lots of choices, though the effects of many of them will only be seen as the story continues. I like to think there are no bad choices in this game, just things that subtle shift the story and MC's perspective.
I will for sure make a big announcement if the game ever is put on Steam, though my focus is on itchio at this time.