I have to commend you on the editing, cool music. Well done my friend. I would definitely utilize TubeBuddy SEO tool as it would have picked up on the missing end screen. You can use placeit.net to generate a template you can pop into the very ending to keep them cycling thru both your other clips, subscribe to channel widget and more. Heck it might even help you get subs going too... Double win subs & views... my $.02 for what its worth lol