I completely forgot about this game, it was so good. Is it like abandoned abandoned or is the dev working in the back just really slowly?
Look at it this way.
There are two facts weighing against eachother on each side of a balance.
1) The developer claims almost angrily that he works hard, so hard people can't even imagine.
2) The title hasn't seen an update for a year now.
Draw your own conclusion which fact of the two is solid and which is just empty talk.
Alternatively, wait for the next update (lets just assume it will come) and decide yourself if that update warrants this one year long development time. If yes. The dev worked hard. If not, he is just bullshitting. If we get a perfectly normal sized regular update that we have seen in the past, it was just bullshit through and through since those took a couple months in the past = It taking a year is proving he wasn't working on it at all, let alone hard.
If it delivers content that is around half the size in terms of renders and plot progression that is already in the game? He genuinely worked hard.
Me personally, i draw my own conclusions a long time ago. (It isn't the hard-at-work candyfloss scenario

).