For my game I have chosen to produce a Medieval Fantasy, roguelike dungeon crawler. It will focus on hand-to-hand combat but will have some ranged combat and stealth scenarios. The game will start with a tutorial going over some of the basic controls of the game, with simple scenarios to introduce the player to the game. After the tutorial the game will go to a screen where the player can select a difficulty and then continue to play. The game will be similar to other roguelikes such as "The Binding of Isaac" and "Spelunky" as each of the main levels will be randomly generated. Killing enemies, and completing dungeons will grant experience points which count towards the level of the character. Levelling up will allow for the player to access new abilities and make their current abilities better using some sort of skill upgrade system. The enemies in the levels will scale with the level of the player but there will also be different difficulties to the game to make it easier or harder for the player. There will be items to pick up in the dungeons that will increase certain statistics of the player such as their attack damage or defense to allow them to progress and fight harder enemies. If their character dies they will return to the main menu and have to start again. The main goal of the game is to make it as far as you can with one character before they die. The player will only be allowed to have one character at a time and starting a new character will delete their previous one. This is one of the main gameplay mechanics of a roguelike game.
My game will have moderately realistic looking graphics similar to games like "The Elder Scrolls V: Skyrim" but will focus on bringing out the medieval fantasy aspects of the game. It will focus on making the dungeons look realistic while keeping a focus on the main themes of the game. Similar to Skyrim there will be multiple different schemes for the dungeon aesthetics that will appear at different depths of the dungeons. For example; at the start of the dungeons there will be a more generic, crypt-like look to the dungeons but as the player progresses it may fade in to a more Dwarven themed area, similar to that of the Dwemer ruins in Skyrim.
These screenshots are taken from Skyrim. They highlight the two major themes of the game's dungeons. Even though my game will have more than two dungeon themes, the dungeons of Skyrim will be a large source of inspiration for my theming.