Are there preset levels to play? I couldn't find any. It would help to introduce someone new to the lasertank games.
There are but their default location (inside the itch apps folder) makes them a little hard to find. Fortunately I have a solution in mind for solving this problem. I will make an update to address it.
Thank you for reporting! This is now fixed - LaserTank now has an "Open Default..." menu item for this very purpose.