Yandere Interactive is a newly established indie group, specializing in aspects of horror and visual novels.
Here's the sprites for most of the girls standing in your way!
From left to right:
Kasumi the Rival Yandere, the Tsundere, the Kuudere, the Dandere, the Kamidere, the Himedere, and the Deredere.
Check out this previous collection of pics for their alternate appearance: Indiedb.com