Suggestion: make the currency (or whatever you may call the amount of Lvl 1's you have) visible when you click on the upgrade screen. It's a bit tedious having to switch back and forth to see if you have enough to buy next upgrade
My one real problem with this game, is a random enemy can come flying out from off screen because it was hit from a shockwave, and fly across your defense line, immediately making you lose. IT has happened to me wayyy too many times.
I'm having a problem, not sure if it's a bug or not.
As the level progresses, the fire rate of my champion (in my case the archer) goes down, making the level more difficult through every wave.
i didn't find Jonestown that bad, i spent four days there and still managed to get to Union City.
Overall it thought the game was very good but I found it difficult to move around inside the barricade at different times.
4/5
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I will add your suggestion to the list of planed features and will add it in a future update