Steins;Gate Movie: Fuka Ryouiki no Déjà vu, Kimi no Na wa. Recommendations
Both are touching movies that have to do with time travelling and changing fate. Beautiful art, entertaining and creative concepts!
Both films deal with themes relating to love and death in the face of extreme challenges, time, and memory. However, Kimi no Na wa is far better executed than the Steins;Gate movie.
Time travel elements and also have similar "forgetting names due to timelines" kind of stuff. Just go watch it and you'll get it. It's a definitely must-watch if you have already watched Steins;Gate.