I looove the level creation tips! As a small hobbyist game theorist/designer I have always struggled with making actual good levels. Isn't that weird? It's like I have no trouble coming up with cool building blocks for a game and general throughlines for a level, but using the pieces in smart ways to conduct the player's enjoyment is so tough for me. Maybe this game will actually make me a better designer, and that would be worth the money tenfold alone.
I do recommend that you get a stylus if you ever aim to create your own levels. I got a Meko 2-in-1 stylus that seems to work great. Lot's of other brands make the same type of stylus and I think they are all qualitatively about the same. (It's a stylus with a disc tip and a rounded fiber-tip.) They are around $10.