Yeah, the way that this game is now is way too easy, if they going to fix the Income problem they also should increase the difficulty or at least increase the cost of the units and/or upgrades.
Game needs a complete rehaul to me, I went from medium to insane with no problem :| but I'm glad to see that you still put a lot of work into helping people.
Yes I think the game was a little bit disappointing too, it's basically the same thing as the first one.
And there is two more "important" glitches, you can create the mage(medieval age) and the cannon(renaissance age) units without unlocking them, just click in the unit image, even with the lock in the image you will be able to create them.