I am very happy if it was a little bit helpful! And sure thing (hope it's the right way to post images here), this is how it looks when I press Esc to summon the menu:
This is an error when I use save button on screen:
I didn’t realise that it actually gives different errors. Just in case, I use Mac and usually load games from the itch.io app, tell me if you need more detailed specs or smth. I can also try it on Windows to see if it will still occur.
And yay, thank you so much for answering my question. Kukukuku I had a feeling he must be that pretty and cute for reason, glad I got it right! :D