First of all, congratulations on making an excellent and innovative tower defense game. I had a couple of suggestions to help with the end game:
1) More detailed information on your units. A screen that listed relevant states would be helpful to plan a base optimally.
2) Another big "plus" would be DPS (damage per second); why would I care about total damage, when some of my towers have been around since day one?
3) Some of the upgrades are mislabeled -- I noticed the wall upgrade used the wrong name. It's also unclear when you can upgrade your buildings or not to more powerful versions.
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