I'm really glad to hear these kind words! Thank you so much for playing the game and for the feedback.
It's a relief to hear that the level design worked. I used quite a lot time to just think about the order in which to show new game elements to the player and to have interesting difficulty curve. I would had like to have more levels in the game but there was only so much time I was able to use for the jam and there was a lot other tasks than level design.
Similarly, I originally would have wanted the game to have more narrative elements. I had a concept for the narrative but there was no time to develop it further or add anything concrete in the game. I would be interested to know what kind of things you would have hoped for in a narrative: environmental story telling, dialogues, ... ? Also, what does metanarrative mean? I'm not familiar with the concept and Wikipedia did help me to connect it to games.
I will tell your comments about the art for our artist as they are probably not following these comments as closely as I am. They will surely be happy.