The things I love are not always good. I like stupid ideas. I like things that think a little out of the box, even if they happen to be rough round the edges. Space is Key is kinda like that. It's mega simple, and looks a bit rough, but I love the implementation.
I love the way the game is in constant communication with you, willing you on, congratulating you on your successes. It makes a difference! For some reason the game feels really personable.
It's a one button platformer on rails, sounds drab, but it's varied and works around simple, effective game design. Well worth 15 mins of your time.
Space is Key [Armor Games]