Genseki Wakusei (幻石惑星)

Overview
Genseki Wakusei (幻石惑星, lit. Gem Planet) is a Japanese Yume Nikki Fangame created by TOM, the developer of nostAlgic.

Gameplay
You play as a girl named Pershina (ペルシナ) who is in a small place with a big crystal gem. This is the only place you can open the menu screen to save the game. Interacting with the big crystal gem will warp Pershina to the Nexus, from which she can with the 4 edges of the screen to explore more worlds.

Effects
In this game the effects are called "Stones" (いし).