Save System

Allow the player to be able to save their progress in-game, and load that saved data.

Levels and Dungeons

Implement additional dungeons with unique layouts, themes, and enemies for the player to face.

Boss Fights

Create boss monsters that are difficult challenges for the player to overcome.

Additional Items

Create more items that grant unique effects to the player. Including but not limited to additional stat-boosting items, and items that provide a major benefit but have a drawback to the player.

Skills

Implement additional stats and skills associated with the player's character.

Story and Quests

Add a simple story to the game that fits the theme of the game being "Gratuitous" as well as side quests for the player to complete for rewards.