Talking about color 13 (tan)?
I plan the game to have 2 gamemodes:
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Normal: Score is tracked by how many enemys you have killed at the end of the run, you earn a heart for every 15th enemy you kill.
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Waves: Score is tracked by what wave you were on at the end of the run, you earn a heart before every 3rd wave, each wave will have 2 or 3 enemys more than the last.