thank you for playing UW and for the feedbacks!
while most of what you said here is till valid, please note that itch version is an old version of the game. We have contacted support to increase file size limit but haven't gotten anything back from them for a while now.
You can play the new update through Steam free demo. I know Steam isn't an option for some people, so we might upload it in some other link if Itch support doesn't reply soon.