I was gonna post to try giving it until Undyne, but I see that has just been done.
Follow your instincts on if you want to continue at this point. It was my #4 game of the decade for reasons like the video Neato posted, but your mileage may vary.
O P E R A T I O N O U S T :
Nominate SHEIK!
https://i.imgur.com/OpudFxm.jpg