It's tough man. Being a software developer myself as well as converting one of his old games, it's not so easy to always deliver when you say you are going to finish. First of, if people start asking when the next update will be, it's nicer to tell them in the next week, if you think it will be doable by then, than telling them...Not sure, could be a month, could be two months... I'm not sure.
Then life happens, your RL work get's in the way. Your GF/wife complains about you sitting in front of the PC every night, family comes to visit, hardware giving issues, software giving issues, unplanned bugs that takes hours to find and some days you just do not feel up to working on the game. I know HG is getting Patreon money, but sometimes you just need a bit of a break.
I know there are a few developers on here that delivers like clockwork, but the emphasis is on few. HG is one of the more regular updaters on the site, but sometimes shit happens. For me his track record speaks for himself.