My top 5 list of 2020 games that I played (in no order):

13 Sentinels: Aegis Rim
Tony Hawk's Pro Skater 1+2
Ghost of Tsushima
Sakura Wars (2019)
Kentucky Route Zero

There are a few others like Final Fantasy 7 Remake, Hardspace: Shipbreaker, and Hades but it's a hard choice to limit to just five.