Sure! Here's an example of a game implementation as a single HTML file using JavaScript:
This implementation sets up a game area where enemies move along a path from top to bottom. The Kart Kid tower is represented by a green box and it moves from left to right at the bottom of the game area. The game starts by summoning enemies every 3 seconds. Each enemy has its health and moves towards the Kart Kid tower. When an enemy reaches the Kart Kid tower, it gets damaged by the tower. At level 5, the Kart Kid's damage is increased temporarily, making it easier to defeat enemies. At wave 25, a final boss is summoned with higher health and stronger abilities.
Please note that this is a basic implementation and can be expanded upon to include more features, levels, and gameplay mechanics.