Just a tip about exporting to webgl: You can set the resolution in unity player settings (set it to 1920x1080 if you want normal resolution), Also change the presentation thingy to minimal and then just enable the fullscreen thingy in itchio (as you have already done) and it should look a bit better:)
About the game: what the fuck did i even play?? the artstyle is definitely so bad its good:D