Hack 'n' Slash, developed by Double Fine Productions, uses Lua scripting as a core game mechanic. This mechanic makes the gameplay rather open ended, while the game itself does have an end goal. Hack 'n' Slash is built on top of the Moai SDK—all of the game's Lua code can be edited.

Get the game at https://store.steampowered.com/app/246070/Hack_n_Slash/.