I think level 7 has a design error, I was able to just take a miniaturizing potion and go straight to the goal, but there are more things in the level

It's a great game.
Though if I have a complaint, I wish that the controls for the game would work like a virtual joystick.
Okay, so movement in this game is based on how far the mouse is and the center of the game is. While this isn't bad per se, it's flawed on the basis of screen size. For example, you can't move up and down as fast as you would if you were moving left to right due to the screen size's being more longer and not taller. In games like Super Mario 64, the Control Stick allows you to control how fast Mario moved by any degree. The more the stick is closer to the center, Mario is much more slower, but when you go push the stick to the furthest direction, Mario will start running. It can be applied to this game by an imaginary circle in the center. For accessibility, you could increase the opaque of the circle. But this circle will allow you to have full speed regardless of the position of the mouse. If the mouse is on or off the circle, you can go in full speed, while being closer to the center allows you to be much slower.

Gameplay starts off simple and does a good job at introducing new mechanics. I had fun from what I played so far. As for the audio issues, it sounds fine.

The audio functions with Firefox.

Edit: the gameplay is intuitive/engaging in conjunction with excellent level design.

Refreshing don't help :(