I love the idea behind it. I think if, instead of just dots, you could have painted other things that have different effects, it would be more interesting for the player.
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Yeah, in it's current state its not that interesting as you can just cheese the game by dotting the drawing around the earth and then you don't have to do anything, as some other players have pointed out. I agree that something should be added or changed, but I'm not too sure what you're suggesting. Do you mean like different inks or shapes of the brush?