OMG! Aliens 2: Descent
The upcoming spiritual successor to OMG! Aliens.
This time, it is a color-based puzzle game.
The project has been initiated back in 2014, but it still is in the early stages of development due to lack of free time.
So far, there is a working game core and level editor with over a hundred of levels.
The game uses an upgraded version of its predecessor's engine, which has been ported from XNA to Monogame and seriously rewritten in the process.
It is called Corund and is also released as open-source.
MonoGame Xamarin WPF