Aesthetically speaking, as Phive has pointed out, you have really pursuit your own style here. You must be very proud when someone can say that to you, it means that your name now embodies something, and the game itself brings an signature to enhance what you already offers.
From the standpoint of mechanics, I like how difficulties are slowly being introduced. Though, I hope there would have been some sort of screen shake or effect to comply with the "cling" sound effect.
If you do get a chance to read this, may you teach me how you've made the banner disappear? Did you use any form of shader or procedural scripts to make that happen? Or just plain animation created from another software?
Looking forward to get your response.