Wow, I didn't expect much just from looking at the thumbnail, but it turned out to be an amazing experience. The story was mysterious but engaging from the start. It was told in a really simple way, but it didn't lose any of its impact. I loved the music. Did you compose it yourself? If not, it was still really well chosen. Maybe the art itself isn't extraordinary, but the animations are so damn smooth. It was really pleasant to look at.
I don't have much to complain about, but if I had to point something out, the controls stood out the most. I think they could use some adjustment. From what I noticed, there also seems to be no coyote time. The feeling of movement is really important in a platformer, so revisiting that aspect might be worth it.
The first level I died on was level 16, and it took me a few tries to beat it. I also got stuck on level 24. The problem is that this level didn't feel just hard - it felt frustrating to the point where I considered giving up. Fortunately, I didn't, and the rest of the game was really enjoyable and had a good difficulty balance. I think you could maybe add a short delay (like half a second) where the cloud stays in place before moving back. It would make level 24 much less frustrating.
Another really small thing: it would be nice to be able to go through dialogue manually, at least during the parts that pause the gameplay anyway. Also, the controls in the menu felt a bit odd at first before I got used to them. I would have appreciated an option to just use the mouse.
All the small details, like the platformer section sprite changing together with the larger one, and the different crow dialogue lines depending on what you do, were really good. I really liked how the crow's tone subtly changed from level to level, slowly hinting that something bad was going to happen.
I got both endings (the first time I got the escape one). I really liked that you left the "Continue" button so I didn't have to replay the entire game to see the second ending.
Overall, an amazing entry! I loved the story it told. I think that, in this aspect the execution was perfect. The animations were incredibly fluid. The gameplay was good too, but I think that it could use just a bit more polish. I really enjoyed this game!