Very sad to hear that they had to shut down but I am also not particularly surprised. The Shadow Tactics games were well made but also extremely niche. The lack of micro transactions made for a better game but also meant that there wasn’t much recurring income and they had to work while under the stress of knowing that if they make one bad game the entire studio would go bankrupt.
Best of luck to everyone at the studio, hopefully the bonus they are giving out is sizable enough that the workers won’t have to stress out about finding a new job too quickly, especially since this seems to be a pretty sudden announcement.