1. What happened
'Ultimate Endless Runner' A$ package (https://www.assetstore.unity3d.com/en/#!/content/77843) gets broken in iOS il2cpp build.
After the game loads (on iPad), it shows 'High Score' screen instead of start menu. The game works fine with iOS Mono.

Reproducible in 5.5.1p3 and 5.6.0b8.

2. How we can reproduce it using the example you attached
- Build for iOS il2cpp
- Run on a device
---> Game loads and shows 'High Score' screen and stops there.
Expected: Should be able to start the game and play it.

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Workaround is to add the following to link.xml (placed inside Assets folder):

<linker>
<assembly fullname="UnityEngine" preserve="all"/>
</linker>