Just thought I would share this with everyone, they changed the code significantly from the first game so increasing the number of girls you can have in a room is a bit different from the first game. I spent an hour or so looking through the assembly DLL and I have found the way to increase the maximum limit of girls per room for Honey Select 2:
1) Download DNSpy (or use the one included in the "[MODDING] Tools" folder of the RePack)
2) Open DNSpy
3) Inside DNSpy go to "File > Open" and navigate to your Honey Select 2 installation folder then go to "HoneySelect2_Data\Managed\Assembly-CSharp.dll" to open it in DNSpy
4) In the bottom-right of DNSpy, search for "IsEntryLimit" and double-click the only search result
5) In the newly opened code, find the line that says "return saveData.roomList[saveData.selectGroup].Count < 20"
6) Right-click that line and select "Edit Method (C#)"
7) Change the number 20 to whatever number you want (I have not tested above 600)
8) Press "Compile" then in DNSpy go to "File > Save Module" and you're done!
On starting the game you may see an error that says, "Failed transpiling 'GroupCharaSelectUI_IsEntryLimit_IncreaseCharaLimit' '20' index not found!" however, this error can be safely ignored.
Enjoy!
EDIT: Copied from my post here located here:
https://f95zone.to/threads/illusion...-ribidoo-discussion-thread.47630/post-4761331