Maybe I’m just late to the party, but the game was easily completed in a day of playing and I didn’t really have to do... well anything.
There’s a whole mechanism of collecting cards, then combining them to update your towers and equipment... but it seemed fairly pointless, and didn’t seem to have much effect.
You can buy pro to get more slots (room to take heroes or towers into a level) but I just used the same three towers in the three free slots and won every single level.
So I guess I’m saying it was fun, but the progression system didn’t ever feel like it paid off.
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