Sounds very calm and relaxing, would work perfect for an ending to some kind of game! So I think you nailed that perfectly haha. The song has nice pacing, more realistic for piano playing with emphasis on certain parts, a lot of "dragged on" notes for example which I think was really fitting. Good luck with the game and make sure to not give up, and keep up the great music work!
As for the last thing you said, it's pretty common I feel to stutter on finishing and releasing a big track because you are worried you'll mess something up. I had that for years throughout my time making music, and even now! I think it's really good to try to see where you can make things sound better or what you can generally improve, just make sure not to get caught too deep in never releasing it because you're worried you might have missed adding something. After a decent amount of work, maybe some feedback from people you know or whatever if you'd like, it would be a good time to release imo :)