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for the first iteration, you can add this mode with static map, or a choice of 2-3 maps (from existing levels).

Robbie Fraser Awesome game!!!!!! Gj guys, really, I finish the game like 5-6 times already. Plsssssssssssss add the free mode, with unlimited waves(you can use simple logic, for example - aliens will appear every 5 minutes, first wave will be - 30 tier1, 5 tier2, 2 tier3, 0 tier4, and then every 5 mins +10%).