The AI often makes very poor decisions.
It seems like you had difficulty winning a round, so I guess the AI makes perfectly decent decisions
It's not incredible AI, but it puts up a decent fight.
Whether the game is winnable at all seems to depend on initial deployments and AI actions. If it's winnable, it's trivial; otherwise it's a waste of time.
The game can be beaten, and is influenced by many aspects: yes, initial deployment and AI actions, but also your manipulation of the space (keeping weak pieces behind your front line, using bottlenecks), your ability to predict the AI's intention, knowing when to fortify your position and knowing when to attack.
Of course, there is the random element of the dice as well: rarely a much weaker piece will beat a stronger piece, which makes every attack a risk and can throw the power balance at any moment.
There are many elements in this game which make it deeper than you might initially think. It's no "Total War", but there is strategy here and skill is required to win.
Territories and borders aren't obvious enough at a glance (it'd be a nightmare on a small phone display in even mild sunlight). The purpose of emphasizing each hex in a territory with a huge white circle isn't clear.
I didn't want to fill in each piece with a flat color, but instead stylize it. Using the circles and faded colors on a white background was how I chose to do that, but I agree that the borders could be improved. If I remade the game, I'd implement them differently.
Thank you for your opinion.