I found something I think is a glitch near the cave entrance/exit in the side of a the mountain range. I was darting down w/wind resistance coming off the wing edges in jets, pulled to a near parallel with the ground, & hit the ground while in one of the bushes nearby the entrance/exit; the eagle's body went all the way through the ground. Underneath the mountains I could see this huge lake, a vast empty space above the lake, & the rocks that wall the cave/tunnel in a diagonalish arch. Once I came back through the earth everything normalized, but after repeating my actions a handful of times the same thing happened. This has never happened anywhere else, & I was a bit puzzled as to why it happened here.
Other than that one thing, the entire experience was very relaxing, & the geometric artwork was beautifully done. Thanks for a lovely game! <3