1. - You make hero and your unit when u pick hero, and when u press F1 he gives command to select unit and that is how it works, isn't it but that invisible hero gains exp and levels (He need to or?) And after level he can pick ability to upgrade, but u can't pick him! - Is that bug or?
2. - Terrain can be better, and map smaller, i must wait 1 min just to monsters come! River is bad, also on Loading Screen it shows large river...
You can make whole map like swamp or something...
3. - Can't play in Single Player, 1 player can't survive, pls make primitive Ai or remove or move that way gates! Monsters come from each side and 1 hero cant win!!!
4. - Upgrade centers are poor, human building in middle of jungle
... If u want make 1 more invisible hero with abilities that can improve your unit hp, armor, hp or mana reg... Also that abilities can to be like attribute bonus(Icon is not shown) And give to hero unit abilities (When players pick one (Can be done from Thunder Clap or...) Upgrade unit or increase something, show credits, commands you can make 10000 and one combination)
OR
5. - Make base, where unit can regenerate hp mana... Upgrade or something, icons bla bla bla. Small one it will be better than upgrade centers
6. - And last thing how to make game more unique or better, create Dialog Buttons! ex: When player press 'Esc' button he can choose what to upgrade, hints and all about game!
7. - If u need help just send me a message