Only HTML, CSS and basic JavaScript. Doesn't have an engine. Everything pieced together by 2 infinite loops. A faster one to calculate and process game variables, and a slower one to update the HTML/CSS for visual output.
Thank you very much for answering! :DI found the interface to be quite modular. If you ever want to explore the idea, I think that making a model of what you did here for incremental IDLE games would be quite innovative. I had the impression the whole time that it was an engine, that's why I asked.Thank you very much for the experience, I'm following along to play the next updates! +I deleted the previous comment because there was a bug and a legion of symbols appeared out of nowhere, sorry!