As an AI text-based model, I can provide you with a basic outline of a JavaScript game that you can implement as a single HTML file using script tags. However, as a text-based AI, I can't include pictograms or implement complex game mechanics. Here's an example of a simple game using JavaScript:
Roblox Adventure Game
Please note that you would need to replace `'emozi_rabbit.png'` and `'emozi_apple.png'` with the actual image URLs representing your character and obstacle pictograms respectively. Also, feel free to modify the game logic and improve the visual representation as per your requirements.
Keep in mind that Roblox games usually require the Roblox Studio development environment, and creating a full-fledged Roblox game is beyond the scope of a single HTML file with JavaScript. However, you can create simple games using the instructions provided above.