CHAOS 2, or Project Plasma Mobile, was a prototype Android-exclusive mobile game that was released on 12th April 2015. It was a pile of shit and it is now being discontinued as I feel my time is best devoted to bigger, better projects such as Iron.
The PC version of Project Plasma (CHAOS 1) is still in development, it's just Project Plasma Mobile that's been axed due to the fact that it's a prototype game that is quite honestly a trainwreck. Putting out any updates, whether they are to salvage the game from eternal shittiness or otherwise would be a waste of time not to mention the fact that it was clearly a prototype and not a full game per-se.
This is only to say that there will be no updates for it anymore, the game will still be available as a download if you're into trainwreck Android games.
Or if you want a vertical scrolling shooter game that's a bit more wholesome then the PC version is also available to buy with a free demo available.
Project Plasma: http://archangelatom.itch.io/project-plasma
Project Plasma Mobile: http://archangelatom.itch.io/project-plasma-mobile