Background image is distracting, otherwise, very good ! It could be gamified with points and fish reproducing, like try to find a way so that users have to maximize some kind of goal while making tradeoffs. Like city building games
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If you could pay for some bonus materials that would be great too. Though I'd rather unlock them randomly from a kind of loot box system.
And how come I can't level up? I don't feel like I'm making any progress without an XP bar. Clearly this person does not understand game design.
Not everything needs to be a fully developed game. Sometimes people make things for gasp the fun of it and not to build a comprehensive game that will appeal to everyone and their demanding cousins.