Pretty cute game! I love the little dragon, he's adorable!
I encountered a bug on the water/swimming levels, the enemies are swimming way faster then I think you intended. The rate of swimming seems different between each one, possibly related to how many are on the screen/level at once. For example on the first screen, the leftmost fish is swimming back and fourth at what I assume to be the normal rate, while the others appear to be teleporting around their pattern due to moving too fast. The jellyfish are also taking less then a second, sometimes a fourth of a second or less, to complete their entire up and down pattern. Given the "difficulty" of the rest of the game up to this point, I suspect this turbo speed swimming isn't intentional. ;) Sadly I haven't passed the water level as a result since I can't really dodge/fight the fish in this version.
Another minor thing: the game says to press X on the map to save, but the actual key that pulls up the menu on my game is D. X key doesn't do anything on the map screen, and the game interface in levels says to press X to jump, which is keyboard key A. Also, the game doesn't say what key to press on the title screen. I had to find out it was A through trying various keys on the keyboard. I know the controls are configurable, but it would greatly help if the menu had a small note or intro saying the defaults when we first start the game.
Despite these issues I still really liked what I played of the game so far. Thanks for making it, and stay safe! :)