Someday is a traditional-styled fangame. The goal is to explore and collect all the effects. It has a light atmosphere and has very bright, unique graphics. It is known for its many areas to explore in the large nexus.
A new feature added in version 0.03 is the Feats system. Feats can be achieved by doing certain things in Itsuki's dream world, such as getting a certain effect, or interacting with a certain number of objects. Getting them is optional, though sometimes they unlock new content. There are 32 feats to accomplish.
Effect use is the 1 key, and 9 is used to wake up (Itsuki covers his eyes). As of 0.06, you can also deactivate effects by pressing 3.
The most recent and final update, v0.10, added crystals that can be interacted with to present one of Itsuki's journal entries that help explain the story.
Itsuki is trapped inside his apartment due to a strong storm outside (looking out the window gives you a glimpse of the storm). Occasionally the power in his apartment goes out due to the storm, but dreaming and waking up again usually fixes it. More details can be found in events and the journal entries.