The giant enemies are a great variation and definitely add a new layer of strategy.
I did encounter a problem though. When buying/upgrading towers, the tooltip often covers the button and cancels out of the buying menu if I try to click it. Usually only the bottom of the button is visible and clickable. This can also happen on the "send wave" button.
 "Squid Ink"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "Giants and Dwarves TD"){kind=icon}