Bloody Trapland is probably a IWBTG fangame. It's also multiplayer.
Chroma Squad can be difficult if you start on a high difficulty. It may seem easy at first, but it's very punishing on mistakes.
And you'll have to deal with that punishment for the rest of your playthrough.
Styx: Master of Shadows has a difficulty setting. This doesn't just up the damage of enemies. This makes them smarter, making the stealth elements of the games much harder. It also does up their damage, making head on combat very, very undesirable. Detection, and even almost-detection is punishing. Unlike games like Elder Scrolls and the Tenchu series, guards don't just return to their post, thinking that body or assassin they saw was just their imagination. To your advantage though, and unlike Elder Scrolls, they will actually search around where they suspect you'll be, instead of bee-lining towards you until a 'certain amount of time has passed of no vision'. You can even use this to put guards in more favorable positions.
Thumper is a pretty intense rhythm horror game. Controller highly recommended, but not required. Game has 5 buttons/2 controls. Left stick/WASD and A/Space. The simple controls makes the game feel more pleasant to play, despite it's relatively intense difficulty.
idk about yall but ive never been able to beat dark souls
Dark Souls-like games are only artificially difficult. The games are large non-punishing tutorials, aside from Demons' Souls, which increases the difficulty of the area you die in. The enemies throw high damage attacks that give you no indication to how the attack will behave. You die, but you now know how that enemy's attacks work. And then you go and pick up the souls/blood/salt/chips you lost from dying, which removes the punishment altogether, and then you kill it.