Interesting game, i completed level 5 and i did not come across any piranhas?
i really liked the graphics and the peaceful ambiance of the game.
I would have liked to see the levels get progressively harder.
Sorry to hear that :( The game should indeed get harder by level by getting higher chances of spawning either enemies or piranhas, so you must have some nice luck! ^^ or maybe the piranhas fear you
Other than that, thanks for your feedback!