The slow update of the game is mainly due to the slow work of the art content and the lack of new ideas in the creation of the story.
In addition, the author has packed too many non-NTR elements into the game, such as Battle H, Alchemical, and the hero and heroine solo, which can be simplified.
The focus should be on the hero, who constantly exposes the priestess cheating during the game
None of the updates were in english and only JP however in a locked patreon message from about 5-6 hours ago there is now supossedly an english version from my understanding.
As a summary
v0.50 adds some new items for priestess + potion maker and a new skill for potion maker + some charms at the blacksmith. There is also one priestess NTR scene with randoms 1 NTR scene with Yarizo + 1 netorase scene with Yarizo in a threesome with the MC and 2 vanilla scenes with the priestess x MC, 3 new cheating scenes with potion maker, 3 bad ends for Iris, 1 cheating +1 NTR scene for succubus. Also supossedly picking the cheating route with the succubus have you only meet her again at the ending while NTR will open up for more content in the future if I am reading it correctly my guess is that her going NTR route has her join the brothel or something while going cheating has her leave but come back to the MC eventually probably as a cheating partner in the ending/epilogue or something.
Also on a side note the changelogs from my understanding are always posted unlocked on the patreon so you can just go there and read them if you are curious in the future.