Which stage did you get to out of curiosity? Earlier stages skew on giving you a ton of space to build which produce a ton of excess units. Using numbers as fodder is the core design of the game
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That checks out, there were supposed to be more instances of enemies actively putting pressure on you (like, certain groups switching to attacking after a certain time) but they ended up being cut due to time constraints. Enemies will definitelly be more dynamic should we decide to continue the project