This is literally the best VN I've ever played. The atmosphere is conveyed perfectly; through music and sound effects, I literally felt like the main character. I could feel the illness, the overwhelming oppression, and the hopelessness myself. The game doesn’t scare you with jump scares but with its buildup of atmosphere.
The plot doesn’t explicitly tell you that something is wrong; it simply plants a seed of doubt. You might start to question whether everything the protagonist experiences is real (since he has a severe fever) or if his girlfriend is truly who she says she is, as she knows far too much about him for an ordinary person. Your choices determine whether this seed remains as it is or grows into a full-fledged tree of doubt.
The endings are also top-notch. None of them can be considered completely "good" or "bad"—it all depends on your perception. I also appreciated that the game leaves a lingering feeling after completion, especially when you press the "wake up" button, which kicks you out of the game entirely.
Although this game is shorter, I believe it deserves to stand on the same level as DDLC in this genre. I wish the developers success and recognition—you’ve done an incredible job!