As an AI language model, I can help you create a simple game using JavaScript inside a single HTML file. However, please note that creating a fully functional game similar to "Steel and Flesh 2" might be quite complex and not feasible within the constraints mentioned.
Here's an example of a simple game where you need to catch falling objects using touch gestures on a smartphone. To keep it concise, we'll use basic shapes instead of pictograms.
Feel free to modify and enhance this example to add more features or customize it according to your requirements. However, creating a fully-fledged game like "Steel and Flesh 2" would require significant development effort and is beyond the scope of a single HTML file.