First of all good job on the game and here's my feedback:
- I gotta say that the colors of the game are really nice
- The pirate sprite keeps shifting it's position when jumping and landing or changing sides so you gotta keep it in the middle.
- I liked the rain effects honestly . but maybe you could have them 2 pixels tall.
- Sometimes jumping becomes so low when the platforms position changes which makes pirate unable to jump well.
- Maybe put a visual indicator on where fish will land and make it move in a non linear way ( goes up fast then slows till at top then falls back slowly and gains speed going down) , this way it's more realistic and easier to avoid.
Overall , Good job