Thank you so much for your feedback! Regarding the long loading times, it's because you played the web build, which loads individual elements between scenes to avoid overloading the connection. I encourage you to try the Windows/Linux/Mac build for a smoother experience.
As for autosave, it also works in the PC version and saves the game when you close it.
Also, congratulations on your first comment on your account! We're honored that you created it especially for us!