Honestly so far the campaign is a lot more entertaining to play than the PvP I recommend expanding on it a lot. I usually love playing PvP but it sometimes takes forever to find a match and to have no campaign or PvE to play when it simply takes too long to find a match is rather frustrating.
I am getting huge lagspikes whenever the meteors spell kills a bunch of people, and also the speed of the game seems to slow down (lag?) whenever a lot of enemies and / or allies are being killed by any source.
I love how you feel rewarded for doing good things in the game. You do it because you want to help them not because it gets you coins. A really well made game I would love to play more of these games.
Add a a circle showing what wins against what somewhere so for people who haven't memorized it you can just look at the circle (or any form) showing what wins over what in a battle (ex. ranged > charge and armored) it is really troublesome to open the diary and look it up every single time before you just know it out of your head, it could discourage a lot of players from playing cause it is just that annoying.
To be honest, you CAN see the combat skill system DURING the battle. There is a small icon in the upper left corner in the combat screen: clicking it will enlarge it. ;)
For new players maybe allow them to view the creatures they can summon from the buidings before they buy/build the building not just the name but also the costs, power etc. it would be really helpful so that you don't feel cheated when you buy something like a lich thinking "Yes now I don't have to buy skeletons they'll make it for me" and then notice, nope it doesn't you just used a huge chunk you couldn't use because you didn't have the right resources and it doesn't summon skeletons.
We'd like to give some unit's special skills, but right now, with this engine, we couldn't. Right now, any unit has juts higher combat value that the previous, we're sorry.
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To be honest, you CAN see the combat skill system DURING the battle. There is a small icon in the upper left corner in the combat screen: clicking it will enlarge it. ;)