Great game but lacks some things...
Really nice game, fun and entertaining. The sound and grafics are pretty good.
I´ve got some suggestions on info, bugs and new features to be added (to make it 10/10).
INFO TO BE ADDED:
Add counter display of wave and campaign level , like: wave 10 of 15, level 03/08;
Add stats info on active units, friend and enemy (when the mouse is over them);
Add "mouse over" info on unit stats and costs (so you can know before you buy) in the unit tab and in the unlock menu;
Add more info on orbs and upgrades, showing how the stats will change (the avaliable info is confusing).
BUGS TO BE FIXED:
Fix some stages screens wich do not scroll properly;
Fix the sound button;
Fix bugs on support mines (the resources are misidentifieds in several places, like the coal color, sometimes green, sometimes purple);
Put solid buttons on gui menu to avoid bugs (If u have an unit under a button, it will act on that unit on the moment you click the button, making undesirable actions, like curing it and stopping you from cure other units) -> Got a screen print on this, just check my userpage news to see it.
NEW FEATURES TO BE ADDED:
Add more back to main menu buttons;
Add a way to save your progress;
Add a way to control the wave speed (waiting easy waves to end can be boring);
Add a way to cancel actions (like clicking one more time on the action button);
Add a way to destroy units (so you can replace then for other ones).