Sure! Here's a simple implementation of a game called "Sneake Gem" that meets your requirements:
Sneake Gem
Timer: 50
Score: 0
This HTML file includes a game called "Sneake Gem" that can be played on a smartphone. The game features a timer of 50 seconds and a score system. The player controls a sneake head using arrow keys to move around the game board. They must collect gems represented by pictograms while avoiding hitting the edges of the game board or their own tail. The game ends when the timer reaches 0, and a final score alert is displayed. Enjoy playing "Sneake Gem" on your phone!