Your renders would not happen to be in .png format, would they. The game is at v01 and is already 1GB. If your renderes are in png, look into switching to lossy webp. Your renders are renders and not pixel art.
Also, Agnes is a nice name.
;-)
png is only good for buttons and ui elements. Anything coming out of a rending app should be compressed lossy with webp and appropriate settings. You can even get away with half the size of jpg in many cases.
From my understanding, the rendering app did practically the opposite of what lossy webp will do. So it should compress fantastically. It used math to flesh out the picture and render the model. So math should be able to compress it even better than a natural picture.