More story developments.
New map to temporarily explore: hotsprings.
1 new Ayumu x Rin h-scene (Takumi is present too.)
Mary map events:
1 Mary x Ayumu h-scene, with two parts depending on progress.
2 repeatable variations after checking their respective icon.
Hanako map events:
1 Hanako x Mirio h-scene, with 3 parts depending on progress.
2 repeatable variations after checking their respective icons.
Natsuki map events:
1 Natsuki x Daiki h-scene, with 3 parts depending on progress.
2 repeatable variations after checking their respective icons.
1 more Ayumu x Mary h-scene to cap off the update.
From the 3rd Test forward, you can interact with the mirror icon to talk to a Mysterious Person, who will ask you to gather Fragments.
Fragments can be gathered across specific maps by finding hidden icons and answer King of Summer-related questions. A total of 5 can be found, counting the story-mandatory one.

As of now, rewards can't be exchanged for collected Fragments (this is coming out next update).
An issue in which sounds would not play properly in certain maps has been resolved.
The amount of waypoint markers has been decreased per map, so traversing isn't so slow.
The clickable size of waypoint markers has been increased.
150+ new CGs/renders (including variations).
55+ new animation/videos (including variations).
25k+ words of dialogue and narration.