I just pdated nebula game a few weeks ago.
For those who do not know about the new update, it fixes a lot of bugs, and also makes the whole entire campaign free.
It fixes bugs in places like MultiPlayer, and some others that are hardly noticeable.
I'm surprised by this update, because it hasn't been updated in 2 years or so. It looked like abandonware content.
But then to my surprise, they release this big giant update, which who knows, they might've been working on it for a long time.
The app costs $0.99 now, but if you have already got the app when it was free, there's no need to pay.