This is a repost (from last year) but the Umihara Kawase games I list have become more cheaper now.
Sayonara Umihara Kawase - is 70% off so it costs $4.49
http://store.steampowered.com/app/378750/
It is a physics-based puzzle-platformer which is all gameplay, no story. There are 60 stages in total, the game can have a very steep learning curve for you to learn techniques and for how to find a solution to a stage.
That is why I provide a Physics Guide linked here:
http://m.neogaf.com/showthread.php?t=1298029
so that it can help people to finish the game so that they may want to try previous entries in the series hence:
http://store.steampowered.com/sub/85452/
There is a
Trilogy of the series available to buy on Steam. It is 70% off so it costs $8.99
This comes with the original Umihara Kawase which released on SNES, Umihara Kawase Shun: Steam Edition which is based off the PlayStation game and then Sayonara Umihara Kawase if you hadn't already bought that.
You have the option of buying all 3 games separately if you happened to already own one of them.