Presumably, there's some novel IP that is keeping some of the company alive. From the website:

What will happen to Tiny Speck?

Tiny Speck, the company behind Glitch, will continue. We have developed some unique messaging technology with applications outside of the gaming world and a smaller core team will be working to develop new products. But now is not the time to talk about that. Right now our concern is with the players and our comrades who are suddenly looking for new work.