This is the second game I've found out recently that is written in Lua. The first one one being - Beyond All Reason.
Other games with Lua scripting: Roblox, Baldur's Gate, Civilization VI, Crysis, Factorio, World of Warcraft, Far Cry, Leadwerks, Friday Night Funkin', Foldit, Garry's Mod, Aquaria, Balanced Annihilation, Bitfighter, Bos Wars, Cataclysm, CivCity: Rome, Civilization: Beyond Earth, Company of Heroes, Cortex Command, Counter-Strike 2D, Crimson Steam Pirates, Dota 2, Dungeon Crawl: Stone Soup, Dungeons, Dungeons II, Dungeons III, Elven Legacy, Empire: Total War, Escape from Monkey Island, Eufloria, Exodus from the Earth, Angry Birds.
Lua is traditionally the scripting language of choice for game development. It was absolutely ubiquitous in the industry before the days of Unreal/Unity. Famously, all of the WoW UI was Lua.
Oddly enough, I learned that they used Lua by reading the license information which came with the game. I don't remember if it was on the back of the box or in an paper insert, but it surprised me to see it included for some reason.