Closure is a platform-puzzle game in a very unique form.
It has a very beautiful and minimalist (and kind of creepy) design all in black and white and very good sound and music as well. The way the game works with the shadow/light is pretty cool, and the levels are very well design, some of them has more than one way to be completed or some "secrets", and that's pretty cool.
The gameplay is pretty simple: you walk, grab some items, jump and enter the doors. That's it. The little tutorial in the beginning of the game is cool and teach that in a nice and practical way.
The light/shadow trick is the heart of the game, only the things that are in the light are visible and exists, you can't go out or place any object in the shadow. This is the point of most fun and sometimes frustration.
The idea of taking a light always with you to know and (literally) make your path is awesome, and very original. It is explored in many ways until the end of the game but there are levels that you will take so much time to you figure what to do and in the last moment you let go that beam of light and it's all lost because the key is gone in the dark.
The good point is that you can play it for 15 minutes or so, clear one or two levels and return later, because you will not have to learn all over again. It's pretty intuitive.
So, if you like some puzzles you should definitely try Closure, it is nice, simple, beautiful, original and challenging.