So I watched the episode just now. And wow. It was probably the best farewell episode ever. Every thing was on point. Of course, my bias may be involved in this owing to a certain event of interest for us. xD
There's one good point to note here, there was never any mention of Alola. Every other end episode spoke of the next region, and every other saga showcased at least one Pokemon from the next generation. None of that was done. But that's something else.
As for AmourShipping, I think we can safely call it canon. Yes some say semi canon, some say ambiguous. But there is more than enough certainty regarding the kiss, when frankly, there was no evidence of it- be it a kiss on the cheek or the lips. It wasn't shown. We are content with making the safest assumption there. So I will make the safest assumption here. AmourShipping is canon in my eyes.
As for Serena calling Ash her goal, it means she sees living a life with him as her goal. She told Palermo that she likes making people happy. Today, she made it more specific. She likes making people; and more specifically Ash happy. It's evident that by calling him her goal, she means that she intends to marry him at one point and live a life with him.
Ash's silence and facial expression; or in other words, circumstantial evidence, points to him accepting her feelings. It is made as clear as daylight actually. So yes. In short, we are done.
However, I feel rather bad, seeing the end of XY. It was the best saga in my eyes, and the traveling companions were so good. More importantly, Serena was a character I really liked. And to see her go, well. It does pinch, even if AmourShipping was made canon.