Back when I first discovered OpenTK, one of the first projects I embarked on was a game I named Hoshi (original post on it).
For various reasons I discontinued this.
Recently I've started a "game a month" style thing and Hoshi seemed a good idea to revisit, so I've completely rewritten the engine and today I'm releasing it.
The full devblog for it is here.
A video of the new engine all running smoothly is here.
EDIT: Fixed version downloadable here.
Sound obviously relies on OpenAL, so that needs to be installed.
Supports custom keys and Joystick controls in the options menu.
It should work on Linux and OS X although I've not tested it on either, the OpenTK.dll.config file is included anyway.