I found a gamebreaking glitch that I feel you should know about. I was grinding on the map before where you find the chef, and somehow I got hit pass the invisible wall on the bottom edge of the screen and couldn't get back. The only option was to go down which took me to an endless series of black screens, with a small multicoloured square thing in the top? Being here also reset all my upgraded stats. I was able to quit and reload my save though it was still a bit annoying to be trapped in a void.
This game would be much better if half of the controls weren't working against the player.
I hot flipped off a moving platform way too may times for me to even consider bothering to finish this game. If you land even a pixel too far to a side of a monster, it will kill you, even if you've landed pretty squarely on it's head. So on and so forth. Plus the flashes are just, painful. A terrible design choice.
Those gauntlet run levels honestly are more annoying than fun, I was enjoying the game until those. It was gonna get 4 maybe even 5 stars but now it's getting a 1/2
For everyone struggling with the boss I watched his pattern for a bit.
He will go one swipe at the bottom with mouth open (Eating your fireflies) and then one without mouth open (Safe to be hit with), it will then swap to do the same at the top. One swipe with mouth open, one with mouth shut.
Change sides when the shut mouth sweep happens, check for fireflies and then rinse and repeat. It's pretty easy this way!