NaruEver has a Patreon account you can subscribe to, and I'm not sure if it's worth it right now but he changed it so he receives payment every update, so not once per month like usual (others like GigaSaddle – Pervader are doing the same). Since you won't be charged for nothing there's no real reason for why you shouldn't subscribe, but I leave it to you to decide.
Apparently, updates are really slow because of his editor. Here's what he wrote last, I just fixed the language errors to the best of my abilities (there might still be errors left):
"Hello and sorry for no updates in a long time.
I got many messages about whether or not I'm still working on Lunateria or the project is dead. My project is still on-going, however, but lacking the material to update. Because of my fault, which happened to be sending the longer than previous Chapter 4 script too late, my editor, who is in fact working on several writing projects, estimates my script will be finalized around the end of the year or later. I can only wait, yet instead of wasting my time I already did what I can in advance:
–pre-coding with unedited script to save time when I receive my script back
–check overall gameplay like character expressions, sound, and music to match with scenes
–complete new scenes and art sprites
–might start writing the last capter's script next month"
If you have anything to ask me you can do so on Facebook and Twitter.
Thank you very much for supporting me until now and apologies for the inconvenience."
Keep in mind this was already way back in August.
Until now there hasn't been a new update to reveal what state the game is in, even though I'm confident about Lunateria's return.