Hard Achievement Issue
I fixed another bug that prevented the achievement obtention. This was due to issues regarding the initialization of both difficulty pop up AND options menu, and how Unity toggle buttons works.
The issue should now be fixed for all NEW playthroughs.
For current playthrough, you can still retrieve your missing achievements. (if you have already completed the game) by clicking this button:

I'll remove the button in a couple of weeks after everyone got the chance to get their achievements back.
Minor fixes
- Slightly nerfed some bullet from the last pattern of the third boss
- Adjusted the map emplacement of a hole in the abyss that didn't match the real location
- Fixed the issue with Map key input displaying "semi-colon"
- Fixed rare issue where main menu became invisible

Argl