You Thought This Game Was Easy? - I Am Fish | Iron Fish | Hard "Bossa" Controls - Pufferfish Level 1
The steep downhill portion is really the only part that can be tricky. Overall though it's an easy level.
Tip for Xbox players: If you want to invert the left stick's Y axis to make swimming up and down feel better for you, go into the Xbox accessories app and invert the left stick Y axis there. It'll invert it for everything though so be cautious about that, but it's easy to just revert it back to normal after playing. Then if you want flying also inverted with the Flying Fish just keep the "invert while flying" option unchecked as you've already inverted it. This made my Iron Fish Bossa run so much better.
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