Loved it! Quite relaxing once you get the hang of the controls, lovely backgroud music and sound effects. The watercolor visuals look great too! Although the theme is definetly present I don't feel as if it impacted the gameplay too much. Some levels were very hard (especially at the start) and when you pass some levels they suddenly become easier again. Maybe look into having more complex levels be generated when there's more fly time for the player. The player controls were okay, I'd say that some more predictable control as to where the player goes (especially with the environmental elements such as wind passages etc.) as sometimes I felt out of control where my birb went. Something to consider as well is giving the player a hint of where the fire is, like at the start do a small puff of smoke right above the position of the fire so that the player knows what side they must explore.
Other than that, again, great visuals (really digged those and the animations!), gameplay is fun once you are used to the controls and great sound effects too! A must try!