I like how the different collectables serve different purposes. It feels really good to throw that pizza slice and see a big portion of the boss's health disappear! I like the bullet hell mechanics, but it's very hard and unforgiving. It looks like touching even one pixel of those letters is enough to hurt me. Combine that with low HP, small invincibility, and no way to regen health, and it can feel frustrating for some players. I would rather have more projectiles and smaller hitboxes to make the game feel more fair.
I also didn't like using the F key to grab since I had to either take one finger off the movement keys or place my thumb in an uncomfortable way. Using the space or LShift key would be far more comfortable in my opinion.
Here is my little speedrun of the game :)