**Designing a game level**

I'm considering whether to create multiple levels or just one. For the initial level, I want to include elements like fire and water hazards, enemies, trophies, and an exit that’s initially blocked until the trophy is collected. I'll have physics like gravity and jump impulse, using an array of strings for tile representation. Tiles will represent ground, spikes, water, trophies, exits, and enemies. I want enemies to behave like simple walking foes that can be stompped on to defeat them!**Implementing game mechanics**

I'm planning to keep things simple and not use external assets, but I might consider WebAudio for sound effects. For collision resolution, I'll move horizontally first, then vertically, checking for overlapping tiles. If the player overlaps a hazard tile, like water or fire, it results in death and respawn. Collecting a trophy will remove its tile and unlock the exit. For enemy interactions, if the player stomps, they bounce back after defeating the enemy. I also need to implement an animation loop using requestAnimationFrame!**Creating game visuals and controls**

For rendering, I’m going to draw tiles using colored rectangles and shapes. The ground will be brown with gradient blocks, spikes will be triangles, water will have a blue sine wave appearance, fire will be depicted as orange flames, and the trophy will look like a yellow shape. The exit will be a door rectangle that appears locked when inaccessible. As for controls, I’ll use the arrow keys or A/D for movement and W or space for jumping. I'll include UI elements to show trophy status, lives, instructions, and maybe even a restart option!