This VN was quite interesting to read through,
especially since I recognize the main girl's voice as other characters from different visual novels.
(eg Yumiko from Grisaia, and Kurugaya from Little Busters, who happen to be my favourite characters).

Anyway, back on topic, most of the choices in this VN have a time limit.
You are told that you can ignore the time limit, but this locks you out from some extra stories.

The notes I have below should help you to access those stories,
and in completing the CG Gallery 100%.

Covered here are:

• Situations where there is only one answer.
  
• Situations where there is an absence of options.
  
• Situations where the answers fit the mood.
  (The summary before the choices usually gives an obvious hint.)

• Scream and Cry
  
• Run Away
  
• Radiance
  
• Reach out my hand.

• Do as he was told.
  
• Mourn his wife.

• Endure his urges.
  
• Scream for help.

• Say nothing.
  
• No longer play.
  
• Explain himself.

There seems to be no time limit for the choices in this chapter,
but this is what I went with.

• Tell his friend
  
• Give up entirely

• Suspect a prank.
  
• Draw her weapon.

• Speak with him once more.
  
• I loved you.

There are no choices in this chapter.

• Return to his sculpture.
  
• Continue carving.

• Forgive her sister.
  
• To forgive.

There are no choices in this chapter.

There are no choices in this chapter.

• Radiance.
  
• Reach out my hand.