Play as the red circle. The controls are the computer mouse (both the one that actually looks like a mouse & the mouse pad on the keyboard, whichever one you prefer to use). The friendly blue circle creates ghostly clones (fully working copies of the original sprite) that add 1 point to your score when touched by you. The green enemy circle also creates ghostly clones of itself, except when you touch one of the enemy clones, instead of adding 1 point to your score, you lose 3 points. Don't touch the enemy clones! If you have more than 14 points when the time's up, you win! If you have less than -20 points, you lose. When you're done reading the instructions that appear when you click on the green flag, press the space bar to start playing.
Just as with Doom on the Broom, I made this using instructions from a book called Coding Games in Scratch, published by Dorling Kindersley, with the first American edition published in 2016, & with the American edition that I used published in 2019.