Reproduction steps:
1)Import users submitted project and build for Android.
2)Build asset bundles via editor drop down menu "AssetBundles".
3)Hit "Load from AssetBundle (synchronous)" GUI button and wait (depending on a device may take up to a minute or more).

Note: Load times are attached in the Edit section.
Note: iOS doesn't suffer as much as Android does when loading AssetBundle.

Reproduced with: 5.3.3p3, 5.4.0b9
Does not reproduce on:
5.2.4f1 (if you consider 25 seconds an "OK" load time)
5.3.1f1 (the best time compared to other tested versions)

DUT:
LG G3 (LG-D855) - Android 5.0
Galaxy Tab3 Android 4.4.4

Workaround: Include assets that reference each other in the same bundle ( not an optimal solution )