Ok. I can see this was probably somewhat unfinished entry. Or I was not able to use the X for the breathing. Somehow I was also not able to enter the levels the second time I started the game. And the first time it was unclear how to actually enter the level. I assumed it happened by pressing enter. Now I'm not sure anymore.
Other than that. I liked the Sonic vibe of the game. Pretty fun looking main character with all the sprite animations. Good job!