This game is probably one of the best, considering the tags. There's no CG, so everything is hand-drawn and this means it requires more time. Finally, last year or two years ago he also said he had a newborn baby, so the time he had to spend on the game wasn't very much.
Games like this take a lot of time and yes, we all know that sometimes some devs take a long rest and try to come up with some excuses. Like everyone else, I would love to see the new update or at least a couple of renders, but it doesn't work like that in every case.
In the end, I would say, yes, too much time, that sucks, but at least I'm not paying for it.