Attention: This comment is written with bad grammar.
Kohana, I believe that means "Small Flower".
Playing some visual novels can make you feel that the story is too short.
Knowing this is version 1.1. This game has potential if it ever got to at least 2 hours long.
If the storywriter can drag the story more and put more development to the characters, it will be more interesting. Put more lines of agony, put more of Ren's feelings when he confront someone else.
Even though the Ren is somewhat emotional, it is not enough to make reader relate with his decision. His character is not that hateable, but not likeable either.
What I can see changing from this story is only Iroha. Iroha had a grim background like Inuyasha, being hated by both sides. If this can be conveyed better and Ren had more actions to explore Iroha's circumstances, we can see how cool Ren is to be able to do something to help her surpass her complex.
What I want to say is, even though both are main characters, the amount of time they spent to know each other and develop in the current timeline in the main story are so few. Met, then part. Met, then part. Met, then will part according to the last choice.
The events after the last choice felt too sudden and rushed. The amount I spent on the climax felt like less than the prologue until before Ren entered Kohana. We are in Visual Novel world, and people appreciates word counts too. Since Kohana uses first person PoV, it will be easier to write how Ren feels add more dramatization to make the player knows how Ren feels and made him more relateable.
I love the name decision. I believe this Ren is written as 蓮 (Lotus), and Iroha is 花 (Flower). The using of Japanese references are great in the story. I hope the next version will be a great.
For the art, I think this webtoon anime style is pretty nice.
For music, I think the "Before Story" and "Credit" felt a bit off of the story content. It's spooky, but I didn't feel the story is spooky at all. For the others, I really like how all of them had "traditional japanese" attributes.