You aren't afraid of a real challenge? If not, play Electronic Super Joy!
This game is fantastic! Sometimes is a bit unfair, but that's how masocore games (trial and error) are supposed to be. At first, you'll lose the count of how many times you died, but with practicing you won't believe you finally passed that damn level! The pulsing music will get you pumped and also helps to make the experience much more enjoyable. There's a lot of replay value if you try to improve your times and/or want to get the achievements.
If you liked ESJ I recommend to buy the mini-sequel "Groove City". It's much more shorter than this game, but has a level editor and a lot of community made levels. It means even more replay value and some crazy stuff fans created.
I think Electronic Super Joy worth the full price, but if you buy it on a sale it's an absolute steal. Even if you're not experienced with masocore games, but are a fan of old-school platformers, you'll like ESJ. A lot!