That's a bug. In theory, the retry button inside the game-over page is supposed to work. In the game engine, the button worked. We didn't have the time to do a complete playtest of the build before uploading the game on itch.io, so we missed this bug.
How have you felt playing the game without a tutorial level? Were you a bit lost, frustrated, or something else entirely? I am asking just to understand how to improve the game.
Thanks for the feedback, anyway!