among the sleep
Mad Stalker: Full Metal Force. 4 versions. Together along with Capcom's Alien VS. Predator arcade, it literally inspired Guardian Heroes, Panzer Bandit, Phantom Breaker: BattleGrounds and Code of Princess.
If you love old school 90's boomer shooters like I do then there's literally no reason not to play this.
Another hidden gem
If you like Dark Souls, Rogue-lites and a dash of Zelda then seriously this game is so worth playing. It's great fun in both solo and co-op and a single playthrough can last up to 8 hours if you really search around its pseudo-open world. Die and you'll have to go back from the beginning and the layout and stuff is completely different. But it's a great time waster kind of game going through it again and again. Plus it's art style is pretty so uh yeah, PLAY IT. It goes on massive sales pretty frequently.
Blazblue, any of them before cross tag.
Xcom! Strategy and Customization!!!
Tales of the abyss- great for someone who is new to JRPG but prefers brawling over turn based combat.