I tend to beat somewhere around 8 games a year, so 2020 has been more productive than usual and I may still add 1 more to the list. Anyways the list goes as follows:
Super Mario World (April 2020): Kind of weird that this is the first game I beat on my Switch, which I bought shortly before the pandemic hit, but here it is. Very good Mario game and fully deserves its praise
Rayman Legends (May 2020): First "proper" Switch game I beat, also a very good platform game. Loved the music stages, but I absolutely hated that there was no overarching story. It is not the game that needs it I know, but even something as simple as "Princess has been kidnapped, go save her" like in Mario would have done the trick. Other than that nitpick very good game.
Super Metroid (May 2020): The second of the retro games I beat this year, and an absolutely fantastic experience which is also very recommendable. Another of the SNES must plays for sure
Wargroove (May 2020): Back in 2019 I beat for the first time Advance Wars Dual Strike on my phone, and I decided to go for a similar-ish game in Wargroove. Very good game though I think the Advance Wars games are better but the series is dead so this is as close as we'll get. Still very good.
Mario Kart 8 Deluxe (June 2020): This is the kind of game that you play over and over online, or with friends and I still play it, but for the purposes of beating it I generally go with "beat every cup on every category". Great game, though with 12 cups instead of the usual 8, and 200cc added (which was a blast even if it is too fast), it took much longer than the usual Mario Kart. The 50cc and even 100cc categories were annoying and way too easy for me.
Super Mario Odissey (June 2020): One of the Switch must plays and a fantastic 3D Mario game. It is not my favourite, as Galaxy 1 will always hold that spot for me even if it is partially nostalgia (and tbh Odissey might be a bit too open ended), but it is fantastic still. I considered going for the full 1000 moons but ended up tired around 700 or so. I did beat the super hard final level though, which is the first time I do that in any Mario game.
Tales of Vesperia (July 2020): Good RPG which took quite a while to get through, but was still fun in the process. Good story and characters overall. I tend to prefer turn based games as more strategic but the combat was as good as I could have expected from a game like that.
Ace Attorney Trials and Tribulations (August 2020): This is kind of a weird one, as I actually began this game in early 2019, then got burned out (I had played the first 2 games shortly before) and stopped right befor chapter 4, so I really only played the finale. And the 2 final chapters were a blast and had me super excited, but I do remember liking chapters 2 and 3 less.
F1 2018 (October 2020): In non gaming things, this is the year where, after not having watched Formula 1 since 2013 or so; I began watching again. At some point, I noticed the game from 2 years ago was available for free as a limited offer, so I decided to go ahead and download it. And it makes for a nice play every once in a while when I want to get a racing fix. For the purposes of "beating" I am considering finishing season 1, where I managed to very unrealistically finish "best of the rest" with a Williams lol (it took me a long time to nail the appropiate difficulty level, so I ended up winning races early on, then finishing last before I finally got a realistic level going)