It features 5 areas:
and 4 difficulty levels:
- Easy: you have 6 lives and if you die, you can continue on the same level
- Normal: you have 6 lives and if you die, you have to start the area over again
- Hard: you have 6 lives and no continues
- Ludicrous: you have 1 life and no continues (unlocked by completing the game on hard)
Also, there's a mini gish difficulty, which isn't really a difficulty level, but it also makes Gish small. You can unlock it by completing the game on Ludicrous.