Very cute aesthetic design. I really enjoyed the various shell types. The glider was my absolute favorite once I figured out how to use it (an in-game message about having the ability would've been nice). I absolutely adore the gliding sequence at the end; I got very excited realizing that the mass of salt spikes was the way forward. The reset button is a very nice utility and safety net.
My main complaint is that the controls are quite slippery and hard to get used to. I also think some sound effects would've added a lot to the asthetics.
Overall though, I like the design, and most importantly, I had fun!