Games like Rem
SIght
SIght is a Japanese Yume Nikki fangame. You play as a cyclops named Nakime and the goal of the game is to obtain the five Items (アイテム) scattered throughout each world to unlock one of two endings.
Dream Escaper
Dream Escaper is a non-traditional Yume Nikki fangame centered around exploration. This game has a unique feature in which players can warp to different worlds (known as "layers" in-game). It features various chasers among these layers that will send the player to a game over sequence when caught. The game also includes the ability to talk to most NPCs and save from the menu. The goal of the game is to explore, collect Items which will grant the player new abilities and achieve one of the game's three endings. As the game goes on, players can unlock various features from the title screen including a minigame, a music player and a Memories section which logs certain accomplishments the player has fulfilled.
Butterfly Effect
Butterly Effect is a traditional Yume Nikki fangame. The goal is to collect all four effects scattered throughout the world. You play as Mari exploring areas which reflect memories.
Mild Dream
Mild Dream is an English Yume Nikki fangame made for Dream Diary Jam 2. One differing feature is that there are two different types of effects: Normal and Lucid. In order to use Lucid effects, the player must enter a state of lucidity by interacting with one of the various bees found within the dream world.
Yume Mienai: Pocket Version
Yume Mienai is a GameBoy-style Yume Nikki Fangame made by Annie-Mienai in RPG Maker VX Ace in 2019. The first version was made for Dream Diary Jam 3. Like Yume Nikki, you can sleep, explore, and get effects, but with the difference that there are RPG-style battles and dialogues.
WeAreDreaming
WeAreDreaming is a Chinese Yume NIkki fangame. You play as Zakurotsuki (附石榴), who refuses to leave her room. Exploring the dream world can also unlock wallpapers, music and menu skins.
Conexus
Conexus is a short Yume Nikki fangame that follows a young adventurer who mysteriously awakes in a realm of interconnected worlds named the Conexus. Uncover the reason why you were brought to the Conexus, and learn about the realm's history along the way. Or if you don't feel like performing story errands, just treat it like a digital museum instead. This game features 17 unique areas to explore, with lots of weird things to see and people to meet everywhere you go. Unlike the typical Yume Nikki fangame, there aren't any "effects" to find here, instead all of the focus is placed on touring a fully open realm where every path leads to somewhere else.
Send You a Link
A mysterious link; a weird program that you can't rid of. Send You a Link is a small, nostalgia themed Yume Nikki fangame made for the Dream Diary Jam 4. The game is heavily inspired in the internet days of 2000-2010ish, including old memes, old teenage obsessions and aesthetics.
Mea Culpa
MEA CULPA is a Yume Nikki fan game, that follows a non-traditional format. You play as a young man, Isaiah who enters a dream-like state after listening to an old music box.
Illove dream
Illove dream (爱梦症) is a Chinese Yume Nikki fangame. You explore Aiko's dreams, who refuses to leave her room.