Thanks for the comment!
Glad you enjoyed the concept of the game.
I'll definitely keep all of these things in mind, especially the increased magnet speed (I was also planning on adding a function that let the magnets swap places with each other so you don't have as much trouble getting them around the levels) as well as re-balancing the sounds like you suggested.
I'm planning on making this game into a bigger project further down the line so feedback like this is really helpful, and means a lot to me!
Also, there are many more really good games made with Construct by developers way more talented than I am, that you should certainly consider checking out!