UI is still the big one. Please see these posts as well:
Other issues/suggestions:
* Sometimes the Food/Production/Essence icon disappears from the map. Usually when the fog moves back and forth. You can still settle on the tiles with the missing display. Re-loading a save-game fixes the issue
* There seems to be a problem with the number and quality of some monster squads. Eg. Attack a group of Mites. Three squads appear all with 5 units in them. 2 of the squads have 9 hit points and the third has 57. This happens with some other monster stacks as well.
* Remove the drop shadow from the health bar in tactical battles. The shadow looks like there is a little bit of health missing.
* Sometimes the health bar doesn't update in tactical battles. Can't see the pattern though.
* Would be good to generate random city names. As it stands when you come across a city you soon learn where abouts in the mix this city stands because of the name. Random names would bring a greater sense of discovery. Look at games like Dwarf Fortress and see how well this mechanic can be handled.
* The Earth Elemental initial tactical battle animation is way too slow. Need to be able to interrupt this or make it faster.
* AI offering tribute works in reverse. Instead of the player receiving tribute they end up paying tribute. This needs looking at also with what displays on the screen.
* Too many stacks on a tile. Suggest you only allow one stack per tile. Monsters spawning could spawn next to the stack.