The way the piano is mixed with its lo-fi quality adds a deep level of richness. The atmosphere is strong, and I can imagine this would make a great ending for a video game. I was thinking it would be perfect for an RPG Maker game, and you're absolutely right. I also believe you would get the job done. You could try exporting the song you're working on and just have it be version 1.
The way I make music is that I don't focus on whether the song sounds good or bad; I just finish them and move on to the next one. I operate on the philosophy of volume, not perfection.
It's about building strong habits and making the process the goal. I'm not focused on making the song perfect; it just needs to be good enough through the process. Hopefully, the process and the improvisation I'm in will create another song. Speed and momentum.
@Rombit how did you decide on wanting to make an ending song?