It's always sad when you see a game with great promise resort to drip-feeding content in order to extract as much money as possible from backers
It's not a drip feed. Considering it's one person having to develop this there are a lot of circumstances that slow production.
Family/Life reasons, Sickness, Exhaustion/Burn out (This happened last year), Communication with artists to actually get the art assets, waiting on said artists to supply the art assets, properly coding and testing the content, spell checking, and a bunch of other misc things . . . it's not drip fed. It just takes a while for content to come out that is actually of quality. It's not as easy as it looks.
Thresh actually communicates and keeps people up to date with his progress down to how many words he's pumped out that day when he gets work done/a scene done (Highest I've seen was around 5k at once). One of the reasons this update took so long was that Thresh underestimated how much time the recent fight would take him due to the variables he was working with and the lines of text.
As someone that has been burned by milking devs in the past, I can say confidently Thresh isn't one of those people.