Few things that i saw to improve on: The shop needs to be larger, i bought all the improvements way before i got to the boss, The game should be longer and have different tactics for waves the farther you get in, I was able to just bum rush each wave and finish with no problem on one play through including the final boss. There should be an actual final boss not just his army in my opinion.
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 "Bit Battles"){kind=icon}
 "Viricide"){kind=icon}