Sure! Here's a simple implementation of the game you described using JavaScript and HTML:
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In this game, you'll see an angry emoji character initially displayed on an empty white background. You can control the character's movement using arrow keys: up, down, left, and right. When you tap the space button, the character will transform into a black dragon emoji with green eyes. Tap the space button again to switch back to the angry emoji.
Feel free to modify or enhance the game as per your requirements!