Can be played with LMB clicks only.
RMB is for confirming planned move but there is a button for that as well.
Enable Viacam Headmouse works.
Fullscreen or windowed.
Has ingame manual.
Has difficulty levels.
Has slight mouse acceleration that slows mouse movement.
Fonts are big with relatively high contrasts.
Works with Windows x64 systems, too.
Does not work on every system. The issue seems to be graphics card dependent. Some got it to work by setting Windows screen resolution to 1024x768 (not every screen allows that - like mine) before starting. After that it has been reported repeatedly that any resolution will work just fine.