My ideas:
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Be able to sort phobias by level of improvement and by most used to least used (to locate them faster).
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Add a map that does NOT have panic tiles.
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Include a map creator (so everyone can design their own).
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Game modes against AI: protect your heart from infinite waves of phobias.
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2 VS 2 player mode.
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Maps where only monster-type phobias can be used (the others CANNOT).