I dont really know whether this app is actually worth $599.95 but it has 4-stars with 254 reviews!
Edit: Although it says free, I just installed it and noted that it has frequent advertisements. To remove that you have to pay another 3 some dollars. Download at your own risk!
Description as per app page:
Movie Maker Free is the best way to create, edit, and publish videos on Windows Phone and PC. Get this powerful and easy-to-use video editor app for making and sharing videos on YouTube, Facebook, Twitter, Instagram, and more. Add filters, effects, transitions, emojis, voiceover narration, music, and more. "Trust me, within minutes you will have some really cool videos." -
FEATURES
+ Edit photos and videos from your gallery or capture from the app
+ 20+ unique video enhancing filters
+ Add special effects and transitions
+ Add titles and captions
+ Add music (or use ours) for a custom soundtrack
+ Easy clip arranging
+ Voiceover recording
+ Add emoji stickers to your video
+ Publish in HD
+ Save videos and share to Facebook, YouTube, Twitter and more!
The $599 RRP, the "Trust me, within minutes you will have some really cool videos." phrase, and being ad riddled makes this dodgy af.
There are plenty of great, free video editors out there which can do everything this one can, but without being misleading.