This was a fun game! I think the game itself was great, and there were some clever mechanics, but one thing that could be improved on is the UX.
For example, I didn't understand how to start the game because the title page looked like a walkthrough guide, so I actually thought that the tutorial under, which did have the UI buttons, was the game.
Another thing is letting the player know with some sound if the level is complete -- I kept trying to move around the character even after I solved the puzzle, though I figured it out eventually (for example, when I accidentally solved the puzzle vertically instead of horizontally, I was wondering why I couldn't move).
But I've learned a lot playing this game -- I didn't even know that you could call webpage things while playing the game! That's definitely something to keep in mind for the future.