Thanks for your feedback. I absolutely agree with your points. If I work on this again that are things I'd build in, and also I realize the learning curve was not very well presented as thats the general feedback :-) I ran out of time to test, but thats well the learning of a game jam!
Just for the small chance you want to see the ending (I guess no one did haha), if its the first level with "free Leah", you can jump with the player on the ground of her "cage", then Leah cann fall through. Now, you can get to the left and "open" that pass for leah, but first with leah you can open the path to the right for the player. I think that was the level :)