With keyboard gameplay(movement) feels a bit struggling. Also I needed (and was waiting for) some advices/hint inside the game; Like - Where to bring Orbs? Where they are located? Good option would be a timer which shows a hint on screen if player is not doing any progress over some time.
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I agree, I tried to indicate it through level design, you encounter the first one in a linear path with the stone circle at the end of it. Beyond that there is no timer because I wanted it to be something you just played, the orbs are there to provide a goal but swimming and jumping is kind of the point - maybe I should have made that clearer.