You're making me jealous with your devlog schedule :P
Also, I know I'm a bit dumb but is it the resolution that you are changing to 640x360? If yes, have you disabled dynamic resolution?
I'm not sure how Fates Gamble looks now, but if you have pixel art in the game, it will not look too good with such a resolution.
Maybe export the animations with a low res but let the game have dynamic resolution.