X-Sight created a group of small yet popular titles throughout the 2000s and into the 2010s.
They have since closed their doors, but were kind enough to make all of their products freeware, to be enjoyed by the community.
This isn't quite a game per say, but an engine to design ambient soundscapes. It comes pre-packaged with several ambiences and a tutorial to create your own.
The engine was originally distributed commercially, and there is currently no key generator available. A free and fully abandoned version was available for a short time; if you have a copy, please get in touch.
Registration information is included in the package curtacy Mason Armstrong and with developer permission.