I kind of get the impression that he's busy with real life stuff. From the looks of it, everything is basically done, I think he just doesn't have the personal time to assemble all the graphics and code. That's my logic, anyway. Why else would it take him a year otherwise?
For example, the guy whose working on the Legend of Krystal remake can't really work from home, cause he has a family, so maybe Grimhelm's got a similar situation, which prevents them from working on their games daily or even weekly. Either way, it'll be done, when it's done.