A Hand-Crafted Halloween World

Step into a bullethell adventure!

The world of Grumpy Jack is brought to life in rich, detailed 2D animation, filled with strange creatures, forgotten corners, and unexpected charm. Every area feels unique, with something new to learn or stumble into around each bend.

You’ll meet quirky characters, unlock a wide range of skills, and piece together a story full of dry humor and odd surprises. Whether you're solving a puzzle, dodging a trap, or helping a skeleton with a strange request, there's always something weird and worth chasing.

If you like classic top-down gameplay, oddball adventures, and a world that doesn’t take itself too seriously, Grumpy Jack is ready to welcome you in.

Features

• Explore a large, interconnected world with Metroidvania-style progression

• Top-down bullethell action

• Learn and master a wide variety of skills

• A humorous story full of odd surprises and bizarre characters

• Five difficulty modes, from relaxed to relentless

• Hand-drawn 2D art and animation in a unique Halloween-inspired setting