Sure! Here's an example implementation of the game you described using HTML and JavaScript:
You can copy this code and save it as a single html file to play the game. The game can be played on a smartphone by opening the HTML file on a smartphone browser. The player (blue boss) can be moved left and right using the arrow keys and can jump with the up arrow key. The boss shoots blue powers and sometimes shoots hearts (
💙). The player needs to hit the powers to deplete the boss's health (represented by the number at the top right). When the boss's health reaches 0, a winning message will be displayed.