This was a good start for a 'platformer/scroller' with the waves theme. I found the jump a bit 'jarring' as well. Meaning the jumps were a little high and landing let less realistic feel. Overall, the core pieces to a solid game are presented and good pixel graphics bring the game to an honest submission.
I don't recall hearing sounds, perhaps its my volume. Also I fell less in control of how to jump and surf the waves. Honestly I didn't read the instructions as usual, so the surfing, speeding up and things were less obvious and could probably be improved.