My best guess is solo developers are releasing consistent small, but regular updates.
In the time since the last update I have made my entire game. While I hate doing the image count, its in the 5000+ range, plus 600 animation files (id guess 2/3rds are unique, and the other 1/3rd are alternate angles).
OBVIOUSLY quality has a lot to do with with. but im not pumping out garbage.
If there was the idea that this team had been working for that time, I would expect to see my game's amount of content (multiplied by X number of developers) in the next update alone. I'm just saying, I personally do not believe there has been consistent development on this project.
I know there is this other game in the works, but until something materializes I don't really see it as a viable excuse. Again, maybe ill be wrong, surprised, and blown away by this next update (I hope this is the case). But I'm really not banking on it