If you made the workers unable to be moved by the cursor, the game would get the slightly needed difficulty increase - Also, spamming only archers is way too overpowered. Great game, but needs balancing.
Hehe, on hard its quite easy until the last few levels, when the big tanks come - why can't we have rocket launchers?
Another thing i found rather interesting was stabbing the menu options :)
I found 4 recurring problems
Character name
Healing system
20 enemies in one travel (Trailing Mercenaries)
and then the -hours thing... you cant get rid of it