Would there be Steam keys for previous owners?

Any plans for achievements to be implemented in the game later on? :) I, and many others, would greatly appreciate that! ^^ It would increase the sale of your game. :) Thanks in advance!

This is one of the comfiest game i know and i was going to play it again on Steam Deck but seems that it's not supported. Game just keeps closing at the start of it... Will there be steam deck support?

I need help with finding the location of the Mountain Goat please? It's the last sketch that I need and I'd like to complete my sketchbook. Thanks!

I feel bit a bit silly for asking, but where's the soundtrack? I purchased the Soundtrack Edition and it's listed as installed under the DLC, but I can't actually find it anywhere.