Sure, here's an example of a survival simulator game implemented as a single HTML file using JavaScript:
Survival Simulator
Health: 100
The above code sets up a survival simulator game where you start in the woods with a campfire that heals 1 HP per second. The total HP is set to 100. The game is enclosed in script tags and can be saved as a single HTML file.
When the game starts, it automatically begins healing the player's health at a rate of 1 HP per second using the `startHealing` function. The player's current health is displayed and updated in real-time. The healing process continues until the player's health reaches the maximum of 100.
Please note that in order to see the campfire image, you need to replace the `src` attribute of the `img` tag with the path to your own campfire image file. Additionally, you can customize the design and add more functionalities to the game according to your preferences.