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A few things occurred to me while I was playing: First, they need to add a pause button. I get overwhelmed at times and it would make it easier to think of what to do next if the bloons weren't charging through my defenses. Another thing kind of goes with the pause button thing. There need to be more speed options. They also need to add a flag or an exclamation mark or something so you can tell if you can upgrade a tower. Sometimes you concentrate more on the bloons than how much money you have and that could lead to ultimately losing the level . Other than that, 5/5.
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I think that in sandbox you should be able to select all towers of the same type to apply the same upgrades to all of them
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The spiked mines are hella op you can have the same setup without them and you lose at round 70 but with spiked mines you can last to atleast round 150