This is a fantastic entry. The core concept is really cool, the style is charming, and it's really fun to play. Something that really impressed me was the natural way the mechanics are introduced. Having the first phase setup the way it is allows the player to practice and get comfortable before moving onto the more challenging game play. Adding green orbs on the third wave was also perfectly time and adds more complexity to the gameplay loop in a very satisfying way. I like that the game provides options, you can slash the small orbs or simply dodge them, which I chose to do more often than not as trying to break them often led to me getting hit. I think the hit boxes are a little off in some areas, I miss some orbs I think I should hit, and get hit by things that I think should miss, but it's only by a minor degree. With a little tweaking the whole thing would feel incredibly smooth. The theme and limitation are wrapped into it all very well, and I think you could do a lot with this!