Cute game! I had fun exploring the world. I like how's there's some non-linearity with the order you get the upgrades in, plus some secrets to find. Speaking of the upgrades, they're pretty fun too. I was expecting maybe a double jump, but getting a triple jump as potentially your first upgrade is wild.
Unfortunately, the game is a bit janky in some areas. Not entirely sure how the health is supposed to work, but I didn't seem to be taking damage from enemies, or gaining anything from the health pickups. The save/load also has issues. Loading restored my location and upgrades just fine, but it also respawned everything I had picked up and reset certain events e.g. the triple jump boss and the swarm of birds.
Regardless, still a fun and charming game!