This game is neat. The boss patterns are fun and unique. I especially liked the umbrella boss. I kind of forgot you can jump until halfway through the CEO. It really balances out the difficulty when you use it. I feel like there could have maybe been even more use out of the jump somehow, but for a small and sort game it's good.
My big gripes would be a lack of BGM and the resolution. While the sprites are made with gameboy in mind, the various animations and movement doesn't adhere to it. Most obvious is the boss drops that spin in a fashion that requires a much higher resolution then the gameboy can put out. Other things like general movement show the player isn't moving per visual pixel, rather it's smoother and more accurate then that.