The linux demo of Aground, containing the first 3 islands of the game.
Extract the .zip file and run Aground.sh (you may need to set its permissions to be executable). If you're running a 64-bit version of Linux, you may also need to install the following libraries: libglu1-mesa:i386, libpulse0:i386.
Controls are explained in game, and it can be played with keyboard or gamepad. The mouse can also be used to navigate menus (but is not required).
Tips/Guide: Reddit.com
HTML5 Version: Fancyfishgames.com