itch.io

Personally, I call the updates the month they came outs update. Just like when we hold some camps or parties, we actually call the month or the season that camps or parties were held, like summer camp, even we have prepared things for camps or parties before that.

I call them v 0.47, v 0.48 and so on. Actually the update 0.47 was worked on in September (the halloween special is part of v 0.48), it came out in October for Patreon members and in November for the public

Calling it the month they were worked on would be kinda strange. 

Let's think this way. Hyao released October's update day 5, so, he has enough time to work on the next month update and release it every month, on the 5° day.