A very simple yet pleasant world.
With no explanation, players may struggle to understand their objective, or be confused about mechanics. Taking flight is a smooth experience, but when there is no incentive to stop, some might not understand that the dulled filter correlates to hunger and might even assume flying is what caused their demise. A simple prompt reminding the player to search for food may help with this.
There is also the matter of assisting other companions. It may take an entire play to understand this is the core mechanic, and even longer to notice the differences and relevance to the symbols that appear when using the “call” function. It would be of great assistance to make them more distinct, or even removed for those in good health.
As for the art, well done. The style is smooth and calming, and the same could be said for the sound design. The terrain changing to match the weather is a nice touch.