(+) Music is fantastic! Very Sea-Worthy.
(-) Music is short, and only a single track. After the song stops, it's just quiet game with no SFX.
(+) I'm all about infinite runners / avoid games
(-) Maybe plan for more than 3 obstacles, and/or, to scale the difficulty in some way, or least break up the passage of time.
(+) I'm jumping in a boat, and getting exactly what I thought I would get.
(-) Due to the combination of 3 obstacles, no sound past the initial track, and no SFX, the game gets pretty monotonous after 5 minutes.
(+) Thank you for a replay button upon losing!
(-) When scrolling off-screen, the music continues, but the game stops. If you add more tracks, make sure the game goes on pause or everything stops playing when I scroll off screen.

Maybe don't plan on someone being able to play for 30 seconds, aim for people playing for 20 or 30 minutes, or more, and plan accordingly.