[UPDATE]: this issue was solved with v1.5.4.
When launching Home on iPhone 6 Plus / 6s Plus, if iOS has been set to Zoomed mode, the game will crash at start.
(You can check your view mode by going to Settings > Display & Brightness.)
This issue does not affect Normal mode.
This issue will be fixed with v1.5.4.
Versions affected: v1.5.3.