The controls were made very fast for the type of game, it was nice that you did not have to redo everything again when you died, but as an implementation of the 4 color theme I did not see it
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The game only uses a dark shade of green, a light shade of green, a white and a very dark blue. The games story asks if the player wants to see more than 4 colours then they get a gun where they shoot the enemies and red blood is spilled, showing the character wants to experience more than 4 colours. The theme is there.