Welp, you already have received tons of quality feedback, but here's my two cents haha
The feeling of progress that you get when climbing the turtle is reaaaaaly good. You get higher and higher, the difficulty climbs up as well, the stakes get bigger... really nailed the feeling. This and the curiosity to know what's on top of the game kept me playing for longer than I expected, despite the simple gameplay.
The controls were a bit too floaty and the camera too fast, but I guess that adds to the challenge. Maybe adding some ingame control indicators would also help players understand that you can run to jump farther in some places (I had some trouble understanding tha shift runs, instead of dashing you in the air, just like in Celeste haha)
Anyway... really good game people 👍