I think an easy way to fix the last upgrade cost being so much higher then gold/kill would be to add a bonus to gold/kill after each completion of all thirty waves.
Btw Great Game!
the only thing i would request is units (humans, orcs, ETC..) in the packs; and if they are currently in the packs to increase their probability slightly
@BerzerkStudio
"Hopefully we haven't started a new axe pun trend. We made a huge mistake..."
i must axe you a question, so let me be a little blunt and get to the point, whats wrong with axe puns?
how bout when we beat the game you give the remaining characters to us computer players, cuz i love the game but my ocd of not having all maxed characters is killing me