i liked the game and I think it was clearly influenced by danganronpa
and i got the black screen when i was reading the final review nut i am the sure the one who killed ooga booga is the old man
You are correct to say It was influenced by Danganropa and Pheonix Wright Ace Attorney.
I'm sorry that you got a black screen during the final review. If you don't click final review and go straight to final deductions the game is beatable.
Glad that you liked the game, it was definitely a challenge to make sure the murderer obvious but not too obvious.