at first the bird felt a bit too slow for me, but after the first upgrade it started to feel much better. so maybe the very beginning is just a little too slow, but the controls become understandable pretty fast
one small thing — the N / M buttons felt a bit strange to me, mostly because these keys are not very common for games, so it took a moment to get used to them
i really liked the soundtrack choice and the overall atmosphere. the game really gives this feeling of some distant unknown world, and it was easy to get into the mood
my main issue is that after around 10 minutes, i felt like not enough was happening. i only got two upgrades, and there was almost no pressure or big change in the gameplay. the core loop is actually nice and kind of puts you into a flow, especially with the music and atmosphere, but i think it needs more variety, faster balance progression, or some new mechanics/events to keep it interesting longer
overall, cool mood and solid base, just needs more things happening inside the loop