Thank YOU so much for playing! :D I'm always very happy to hear when those who aren't really fans of shipping/fangirls enjoyed the game. It really means a lot that you decided to try it! At the end of the day, I hoped to tell a story that could reach all fans of Undertale, should they choose to play it.
!! SPOILERS, just in case!
The fourth photo is actually from the Sans fight during the No Love (True LOVE) route. It's basically from the bad ending if you keep the knife and decide to use it... =)