The art is neat but at the same time it made things hard to see. I couldn't tell what was bugs and what was trees loading in. It would be nice to have some way to increase speed in the direction I'm facing so that I could dive bomb things.
Also nothing bad happened when I was hitting the ground or the water. Also also when I increased my heart rate I physically could not run out of stamina. With the combination of those two things. I could force flap my way into ridiculous speeds. I was going from one side of the world to the other in less than a second. However, since I couldn't direct that speed into a direction it wasn't very helpful.
Good job on this :)