My son (9 yrs old) used plain JavaScript to make a game, and wants your feedback

My son has been working on this game for the last month or so. He got inspired by Prodigy to make his own take on the game.

He's coded all the HTML, CSS & JS by hand in VSCode. He's made the animated graphics on his own using a web based sprite editor called Piskel.

I provided some hints along the way and Google Gemini has been his coding partner.

View source to see the code. He's excited to share and get your feedback!

I find it a little bit difficult to play. One has to be a genius to win. Who's mastermind has thought this complexity!

Sir, respect to you.