I tell you what my problem is, its when the game dont introduce mechanics to me lol
I think there is a thin line between hard and being frustrating and i think currently its more on the frustration side. Running jump will eventually be figured out but took me longer than it should have imo especially since there's no warm up period with regular jumps and movement. Same with distances between platforms, some of them felt like you placed them on the edge of whats possible, there's no grace distance for the player.
My feedback would be to save that stuff to much later, the first 15-30 min of a game is key to get the player hooked and it's ok to make it more forgiving.
Carrying Carl has potential as a mechanic (puzzles and how to get him forward) but i dont think making the player super slow is the right choice. Not a fan of the narrator but more so the writing than the voice.
sorry for being overly negative, the game can be fun but it didnt click for me in its current shape.