10. OneShot (the freeware version) - you guide a cat holding a giant lightbulb. Pretty much Undertale with better art, characters, lore, and music; it's also much less obnoxiously self-aware when it breaks the fourth wall. The 2016 rerelease is very good as well, but I prefer the concise nature of the freeware version.
9. Blasphemous - 2D Dark Souls with Christian elements. Not as difficult as you'd expect (which is preferable to the direction FromSoft games have taken lately), but the presentation is so stunning it could be a walking simulator for all I care.
8. Metal Gear Solid V: The Phantom Pain - open world stealth with controls that are out of this fucking world. An extremely fun game with a lot of memorable moments in spite of its flagrantly incomplete nature and disappointing lack of cutscenes.
7. Nuclear Throne - batshit insane post-apocalyptic roguelite. You die fast, you get back in the game fast. Highly addictive.
6. DUSK - if you told me this was a long-lost Quake sequel, I wouldn't bat an eye. Captures the "cosmic horror shooter" vibe to a T. Very fast, quite difficult.
5. Guilty Gear Xrd: Revelator 2 - a fighting game where every single character is interesting in terms of lore or gameplay, something I can not say to contemporary titles such as Blazblue. A lot of personality in just about every facet of the presentation. A lot of fun, even in single player.
4. Monolith - excellent mix of spaceship shmup and rogue-lite. Already very engrossing on release, but it's gotten multiple updates as well as a DLC that adds even more content.
3. LISA: The Painful - post-apocalyptic existential drama with a hilarious cast. Inexplicably manages to make turn-based RPG combat fun. If OneShot is the thinking man's Undertale, this (along with OFF, but that's the previous gen) is the enlightened scholar's Undertale.
2. Bubsy 3D Remake - the press completely overlooked this one, so I understand people might not have known, but it was a very pleasant surprise and genuinely one of the best platformers I've seen in a long time, with
a vibrant visual style.
1. Tales of Berseria - the second best action RPG of the 2010s (behind Dark Souls) and far ahead of any other ARPG I've played from that decade. Strong combat, but an amazing world and a main party so endearing I go through every extra bit of dialogue they have together whenever I play it again. Basically the second half of Berserk if it was actually good.
I'm assuming the eighth gen started on the 18th of November 2012, i.e. the release of the Wii U. If we took the entire 2010s, Dark Souls would be #1.