Maybe I can add an option to disable it, but I have a feeling that 99.999% of players appreciate it, as without it, if windows decides to perform an update whilst you leave the computer unattended, or accidentally close the browser tab, or the battery runs out, then you will lose all you progress of you haven't been diligent enough to manually save often.
Typing restart or quit is super easy if you want to restart so my feeling is that it is doing no harm, and it's actively protecting against harm too.
Auto save was added because I encountered all the aforementioned problems regularly and autosave respects the players time so you don't lose progress through no fault of your own. We also can't expect all players to remember to manually save and load, especially beginners.
I'm considering the idea of offering continue or new game when you restart the game, but I haven't implemented this yet.
Chris