This is difficult because I have a number of 2015 releases on my backlog and have only played a handful of others from the past year. Based on this I can say these are the titles that I most enjoyed from this year (so far):
https://www.grouvee.com/games/47437-three-fourths-home-extended-edition/
I enjoyed the art style and found the narrative to be quite compelling. I also enjoyed the degree of option in responses. They may not drive the story in a different direction but they gave me a feeling of immersion that I quite enjoyed.
This is one I am still currently playing. However, it already strongly resonates with me. From design to story to character development I thoroughly enjoy what DONTNOD is doing in Life is Strange. I look forward to completing the game.
I have to Include Heavensward even though it is an expansion rather than a full game. However FFXIV is a superb game and MMO. Although I haven’t had a great deal of time to focus on exploring the expansion what Square has added to the world of the game is compelling and enjoyable. FFXIV is one of my favourite FF entries and a game I can regularity get lost within for hours. Heavensward is a worthy extension of a great story.