Hello!

This update now makes Flowey one of the available romance options. 

If on the romance path with Flowey when you leave the ruins for the first time there will be extra dialogue. If you try to pursue any one else while on Flowey's path, Flowey's dialogue will adjust accordingly. 

If you have successfully stayed on Flowey's path through Snowdin there will be a dialogue to confirm at the end.  Flowey's romance locks in at a later chapter, so those on it don't have to commit early.