1 guy, Daisuke Amaya nicked named Pixel, worked over 5 years on one of the best 2d games to date.
The gameplay resamples the early Metroid and late 2D Castlevania games, combining 2d plattform action with exploration and RPG elements.
In the heart a 2d plattform action game you can obtain new abilities such as double jump or a jetpack to explore new areas of the huge world. The game offers 10 different weapons each with 3 upgrade levels you unlock by collecting yellow triangles dropping from enemies.
The sprites and title-sets are made with love and are full of details, different sections of the world have all their own unique feel and the whole presentation is a lovely homage to the 8bit area of gaming.
The music and sound effects are top notch as well and blend perfectly in.
Download for Mac (version by Nakiwo english translation by Turtle)
Download for Windows, Linux and other plattforms