English was perfect, no worries
The game is made in RPG maker mz, which has an events system that makes it a lot easier to build visually, but all the plugins and scripts you can use to alter the base game uses JavaScript. There's other engines out there that have more customizability but I was a beginner when I started this project and RPG Maker is very beginner friendly. My developer has helped a ton in me understanding a little bit more and what they're able to do blows my mind, so if you find an engine and a language you enjoy and work at it I believe you'll make some cool stuff too. Good luck!