Overall this game was a simple concept done well. I have a few gripes that I will detail below.
Level Design/Waves
The waves themselves look very well done, but when moving, I had a little trouble figuring out where I was in relation to the objects I was supposed to pick up because the waves themselves almost look as if they are not moving, only the texture of them scrolls. This led me to get lost a few times. The waves themselves in terms of floating on them and jumping off of them worked very well, but I often found myself missing a chest when I shouldn't have because I jumped just a little too high off of the wave.
Graphics
The boat, water, treasure chests, and solid colored outline on the chests and obstacles all look very good.
Player Feedback
The player feedback is fairly limited in this game. There are no sound effects which is always a miss for me. The Ui is very informative however, so I commend you for that. The particle effect when boosting is well done. I think a sound effect or another particle effect when beginning to boost would be very helpful as well.
Controls
The controls where a little difficult. Using the A and D keys to turn rather than moving left or right makes sense, but I felt at time the speed at which the boat rotates was off. I often felt like I could not turn fast enough to reach an treasure chest.
Summary
This game was very well done in terms of what it set out to do. I think adding sound effects and tightening the controls just a little bit would greatly improve this project. Well Done!