Oh, this one is difficult haha. I managed to beat 2 out of the 5 main puzzles (the cup and the strawberry), the concept of the game is definitely interesting but I agree that it loses the player a little bit. If it had one super challenging level and other 4 easier ones, it could give more motivation to work on the harder one. On a brighter side, I think it's a super creative idea. The visuals are clean and remind me of some games like Feel the Magic XX/XY for the NDS.
I attempted all of them for some time, I really wanted to beat the exercise one, and ended up with something that seems out of a meme:
"Mom, I want UP"
"We have UP at home!"
"UP at home:"
It was my best effort, though, I swear!! haha
This was the one that seems at the same time the most cryptic and the most enticing one (I don't know if I was just a dummy haha).
Anyhow, I like it! I might come back for this "exercise" one.