Hallucigenia (ハルキゲニア)

Overview
Hallucigenia (ハルキゲニア) is a fangame by Trendy-Sabamiso (トレンディ鯖味噌) (Pixiv), one of the co-creators of Yume 2kki (ゆめ2っき). It stars two young girls named Aya (あや) and Aine (あいね). Its current version is 0.008.

Gameplay
You start out playing as Aya in a mostly barren room and access the dream world through a black book on Aya's bed, Aya then takes a different form in the dream world where you can explore. You can unlock Aine later.

Plot
Aya enters her dream world from the black book on her bed. When in the dreamworld you are still Aya, but her appearance differs. It is possible Aya wishes to become this dream Aya.

Additionally, after collecting all effects Aine can be unlocked as a playable character.

Effects
Some of the effects here have been added based on appearance and name only, without actually playing the game. If you played the game and you see any mistakes in how the effects look like/what they really do, please feel free to contribute to this page by correcting them.

Version 0.008
Part1 (Taken from alternative official website)

Part2 (Taken from alternative official website)

Alternative Official Website

Version 0.008 Pixiv release post

Version 0.008 (English)

 * Remade on April 14, 2014. PLEASE REDOWNLOAD.
 * Translated by HimeNikki.

Uboachan Thread

Developer's website