Thanks for responses all!
There are two things I don't really care about, which is a) length, unless it costs 50 dollars for 1 hour, I prefer quality over quantity, and b) difficulty, (I can adjust). Don't worry recommending games a bit shorter or on the easier / too hard side.
dedoporno: In that case stay away from Indingo Prophecy. Not a platformer, but it has one of the two most horrible QTE episodes I have ever experienced (the other being the final fight with Zeus in God of war 2). I actually broke a keyboard, smashing it into the ground, and I'm a pretty calm and patient guy.
Nah, there's a difficulty setting in the game, if you switch QTE difficulty to easy it's a mindless breeze. Don't think I failed even one after I learned were the keys are and that I need to press some together :P
Leroux: Super Meat Boy is more about speed and reflexes than about exploration and story.
I know, but it's character design and art style is one of a kind :) This is what I'm looking after. And I know it's frustratingly hard :P Those kind of games are not like RPGs where you play for 3 hours and feel like you've done 1 small thing. It's more like you play 15 minutes and then you can't take it anymore, but after a break you feel like you have to give it another try and so on and so on :) Sorry I compare everything to RPGs, i'm pretty burnt out on them (which I realised after checking Paper Sorcerer). If I see another bunch of "character stats" I'm gonna murder some...thing.
XYCat: Another world, even though it's not actually a platformer
Ah, completely forgot! Why wouldn't you call it a platformer? I mean, I heard it being called an adventure game, but it's not like you have extensive dialogue and inventory management, nothing point-and-clicky, but you do have to jump, sneak, roll through the sewers, be fast and precise... seems like a platformer with puzzle elements to me.
inc09nito: One thing though: if you really enjoy these kind of games, buying a gamepad is a must. IMO, playing them on a keyboard doesn't make much sense.
It's funny everybody talking about controlers and not being able to pull stuff with keyboard, it always springs up with PC platformers... Me, I'm sooo PC I can't really use a controller, I'm always many times worse, not to mention my thumbs are weak and get tired really fast. To the point of me coming to a friend for Mortal Kombat session with a USB keyboard :P Ofc some key combinations don't work with cheap keyboards but that's what gaming keyboards are for :) I never really owned a console, I think it's what you get used to when young.