If the full game of Black Mesa coming out of early access in 2020 counts, then that for sure. The Xen chapters have some of the most lavish scenery porn
in the whole game and the soundtrack is ethereal. The only other game I can think of that I've played that came out this year is the Switch version of Superliminal, which is trippy AF and kinda reminds me of Antichamber and Stanley Parable.
I'm extremely tempted to say "Half-Life Alyx" but I haven't bought or played it yet cuz I need VR (which is uncomfortably expensive), and even if I did buy a VR kit, I hope it wouldn't be too complicated to set up (my room is mildly cluttered and small). The fact that there's an official Half-Life game that I haven't played yet bothers me, even if it's not exactly Half-Life 3.
I'm also extremely tempted to say "Silksong" but that hasn't come out yet. If it does come out in 2020 Imma update this post.
--------------------Legacy custom music
How am I so creative? I think taking walks might have something to do with it.
Every single level I will ever make in SMM2 will be easier than Ultra Necrozma.