Okay, I know I am using an unsupported IDE. To make it worse, the IDE is also a technical preview version. I am not complaining! 
Anyway, I’d like to mention, that as soon as you hit the Run/Debugging (F5) button, the project shows this build error:
Fehler ““C:\Program Files (x86)\Paradox\GamePackages\Paradox.1.0.0-beta06\Bin\Windows-Direct3D11\SiliconStudio.AssemblyProcessor.exe” --platform=Windows --targetFramework=v4.5 --auto-notify-property --parameter-key --auto-module-initializer --serialization “D:\Documents\Paradox Projects\EasyGame\EasyGame\Bin\Windows-Direct3D11\Debug\EasyGame.Game.dll”” wurde mit dem Code 1 beendet. EasyGame.Game
Still, if you happen to have a fix, that would be nice. 
Edit:
Alright, the break happens only, when you rebuild the project using VS 2015 TP. If you simply run the project using VS 2015 TP, the game will start without errors. If you make changes to the code and build or run the program using the Paradox3D windows, the game compiles and runs fine.
I used git to discover the changed files by VS 2015 TP that cause the break:
modified: SpriteEntity.sln.ide/storage.ide
modified: SpriteEntity/Bin/Windows-Direct3D11/Debug/SpriteEntity.Game.dll
modified: SpriteEntity/Bin/Windows-Direct3D11/Debug/SpriteEntity.Game.pdb
modified: SpriteEntity/Bin/Windows-Direct3D11/Debug/SpriteEntity.exe
modified: SpriteEntity/Bin/Windows-Direct3D11/Debug/SpriteEntity.pdb
modified: SpriteEntity/SpriteEntity.Game/obj/Windows/Debug/SpriteEntity.Game.csprojResolveAssemblyReference.cache
modified: SpriteEntity/SpriteEntity.Game/obj/Windows/Debug/SpriteEntity.Game.dll
modified: SpriteEntity/SpriteEntity.Game/obj/Windows/Debug/SpriteEntity.Game.pdb
modified: SpriteEntity/SpriteEntity.Windows/obj/Windows/Debug/SpriteEntity.Windows.csprojResolveAssemblyReference.cache
modified: SpriteEntity/SpriteEntity.Windows/obj/Windows/Debug/SpriteEntity.exe
modified: SpriteEntity/SpriteEntity.Windows/obj/Windows/Debug/SpriteEntity.pdb
If I reset those files using git checkout -- * I can run the program again.
