Sure, here's a simple button masher game implemented as a single HTML file with JavaScript. It includes a 1-minute timer and uses pictograms for buttons. You can simply copy and paste the code into an HTML file and run it in a browser:
Button Masher
Score: 0
🔳
Time: 60
To play the game, simply click on the button repeatedly to increase your score within the given 1-minute time limit. When the time is up, an alert will appear displaying your final score.