I'm glad you liked it!
I'm currently working on the full version and Yuno Gasai is a great inspo for facial expressions and violent poses. I took note of the grammar and spelling mistakes part and will improve that for the full game. I also want to try to give it all a more natural pacing, I tend to be a very direct person and therefore my writing can become too direct as well, so thanks for bringing that up!
About the backgrounds: I am finishing up the sketched backgrounds, besides that I'll also draw some scenes that are described in the dialogue to bring it all a bit more to life!
About the sprites: There are some different expressions and poses planned and I'm currently especially researching facial expressions for Annabell while also working on their characterdesigns again. Jaspers original sketch vibe was more colorful and tired and I feel like both of them lost a bit of personality in the artworks that I quickly made for the gamejam. So I want to go back to the roots so to say for the full game!
(Also because you said that you love yandere games, I have another one in early development (skecthing&writing phase) called the angels shadow! You could say that yandere of the forest is a bit of a practice round for that one!)