Watching the algae clear was satisfying, but it would be nice if the algae spawn somewhat based on existing algae so that it felt like progress was being made. Other than that, some more features and game elements would be nice.
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The algae spawning based on other algae position was the initial idea, but unfortunately I couldn't figure out how to make it work, so I went with a simpler solution. If I come back to ALGAL BLOOM someday I would like to implement this more complex spawning model as well as introduce upgrade/power up system to give the game some depth.