There is a point that the bars fill up so fast that hovering / clicking the first bar does nothing, and I cannot earn anything to buy my first upgrade even.
Feels a bit unbalanced. Optimal enemy (for both gold and crystal earning) is where you kill it with one hit (say 90%+ of the time). This is due to the slow increase in the gold per enemy. No point in developing critical hits (anyways not where I am enemy #45)
If I mix archers and a ballista at a tower, the archers synchronise their attack speed to that of the ballista! Surely this is a bug, keep the hordes of zombies in check without archers is near impossible.
 "Idle Labels Puzzle"){kind=icon}
 "Incremental Adventures"){kind=icon}
 "Big Bar"){kind=icon}
 "Tabletop idle"){kind=icon}
 "Epic Creature Hunter I"){kind=icon}
 "Decision:Medieval"){kind=icon}
 "Learn to Fly Idle"){kind=icon}
 "Idle Mine"){kind=icon}
 "Feudalism III"){kind=icon}
 "Bubble Tanks Tower Defense 2"){kind=icon}
Press CTRL + F5, then after the game loaded do a Hard Reset, that should fix it!