Decent
I played the human campaign. Reading the instructions is a must. Gameplay is trivial once you learn to focus ranged units. Assassin is overpowered.
Good but
Hard from the first level, inobvious gameplay.
Not enough ratings yet to assess Navii.
Navii: Slavic Tactics appears to be a legitimate app. AppsHunter Legitimacy Score for Navii is 90/100.
Based on 90 of 100 points across 7 verification signals from App Store and developer data.