Sure! Here's a simple game that follows the rules you mentioned. In this game, the player needs to use a sieve to separate different objects as they fall from the top of the screen.
To play the game, you can copy the above code and save it as a .html file. Then, open the file in a web browser (preferably on a smartphone for a better gaming experience), and you should see a canvas with a moving sieve and falling objects. Use the left and right arrow keys to move the sieve and try to catch as many falling objects as possible!
Note: The game code provided is a simple example and can be further improved and modified to add more features, levels, graphical elements, etc., based on your specific requirements.