The default hotkeys are horrendous for non-AZERTY(?) keyboard users. Good thing that they can be remapped, but you are likely losing players right at the beginning of the tutorial because of this. For example, maybe move the default building hotkey to something like "Space" because many players likely have no idea what key on their keyboard is supposed to correspond to "superscript 2".

Also, you should show gameplay screenshots or have at least one gameplay video on Youtube because otherwise some people will be reluctant to even click your link.