Standalone expansion to Goblin and Coins II should arrive on Steam in Q1 2024. The game is in development for a while and will bring 25 handcrafted levels of pure platforming, but will also bridge the gap in difficulty between Goblin and Coins and Goblin and Coins II by providing the player with unlimited continues. Even better, double-jump will be unlocked from the very beginning of the game.
For those who want to be the first to find out latest news and updates, there's a steam page available to wishlist and follow, and thus support the project in gaining visibility. If you have additional questions you can join the discord community and ask directly.