IT TAKES UP WAY TOO MUCH STORAGE

I love the iMovie app sooo so so much it is amazing, however it takes up so much storage. I literally deleted all of my apps and 200 pictures + videos but my phone still says "storage too full" when I try to download iMovie and I dont get why it has to take up so much room. If anyone from the Apple company is reading this PLEASE find a way to allow the app to take up less space please & thank you

Hdnnsjsjsnsnmjdufjwnjdjsnsh about iMovie, v2.2.3