Just a couple of days ago the dev made a Patreon post apologizing, giving some explanations, and saying he's aiming for the first week of June as the release date for the next update.
Yep, I shot him a reply on Patreon a week ago asking about it, and a couple of days ago he replied this:
"Thanks for checking in. The scenes I've been working on and compiling everything else into code have been taking a lot longer than I expected and leaving me feeling burnt, but I'll see this through."