It depends on the game really. Tbh, 'Asuka and the King of Steel' was really linear and didn't have much in term of gameplay, so it was easier to translate and pretty much bug-free. The creator of 'Knights of Messiah' on the other hand is known to have a lot of bugs in his games, which get patched with a lot of update, with fairly complex gameplay and a certain amount of branching events. That game in particular contains more content than all of his other games, meaning more bugs to watch out for and take care of (from both the game itself and the translation), so I can understand why it takes time to release it. And that's good, they need to release their games with the least numbers of bug possible and make them playable from first to end.