I'm using Koikatsu party for pics~
The hat thanks you for your reply! Or it would if it could speak.
It cannot, so instead it... sits there and... does hat things.
It also somehow passes along a few pieces of advice, mainly about optimizing filesize. Setting the RenPy build to archive images saves on space. Also you can save a lot of your scene images in the .jpg format to further reduce filesize with no major loss to quality.
Because 1920x1080 PNG images are going to bloat your filesize to Godzilla proportions...