I really like it. It's a frustrating but fun game.
After giving up halfway yesterday I decided to come back and beat the game today, but it still took me about 50 minutes from start to finish.
I think the way you lose charge while rolling is a bit annoying, but that's really the only complaint I have.
I noticed that if you jump over Shrimpette at the beginning and approach her from the right, she will instantly give you a speech about needing at least five hats.
I believe that it's probably unintended, but I'm personally thankful that I saw it since I might have not bothered gathering that many hats otherwise, and if I had reached the tower only to be told I had to go back down I would have been a bit upset (to say the least).