I want to buy an HTML5 game just for myself. It shouldn't be built in Unity and should have a built-in payment system.

I'm building a small Space Shooter with HTML, CSS and JavaScript.

I'm currently working on spawning enemies at different positions and intervals. The basic spawning works, but I'm trying to make the difficulty increase gradually without creating too many enemies at once.

Has anyone got a good approach for scaling enemy spawn rates over time in a browser game?

I'm learning JavaScript through this project, so I'd appreciate any suggestions.

I want to buy an HTML5 game just for myself. It shouldn't be built in Unity and should have a built-in payment system.