Seems you put in a lot of work into creating this game, unfortunately it has a difficulty of zero.
Author Comments
Zombie TD is a tower defense game. Start your Campaign
to Stop the Zombies from entering your territory.
Use strategy to defend your towers. Earn money in
each wave to Upgrade your towers.
I thoght it was well made
Not even worth trying
that's the easiest game I never see I hate it that's for noob or guy who want to sleep that's work better that's chloroform ! one word : HORRIBLE ! no star.
Yeah no skill required for this game even tower upgrades stays a constant price and zombies drop so much gold making the game...undesirable...Beat the hardest level key word "hardest" with 5 towers and by the first wave upgrades all 5 towers to final form and just sat back and watched the zombies die