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Sorry I should have mentioned here that I'm running Linux and thought the game would run there, since it says so on the download page.

It is actually supposed to run on Linux. But I don't have it and couldn't test. I'm glad you mentioned that. I will try and work taht out.

Here's the contents of the downloaded directory, if that helps:

.
└── QoE_TheGreatDecay002
    ├── TheGreatDecay_Data
    │   ├── app.info
    │   ├── globalgamemanagers
    │   ├── globalgamemanagers.assets
    │   ├── level0
    │   ├── Managed
    │   │   ├── Assembly-CSharp.dll
    │   │   ├── Assembly-CSharp-firstpass.dll
    │   │   ├── Assembly-UnityScript.dll
    │   │   ├── Boo.Lang.dll
    │   │   ├── GETween.dll
    │   │   ├── GUIAnimatorFREE.dll
    │   │   ├── Mono.Security.dll
    │   │   ├── mscorlib.dll
    │   │   ├── System.Core.dll
    │   │   ├── System.dll
    │   │   ├── UnityEngine.dll
    │   │   ├── UnityEngine.dll.mdb
    │   │   ├── UnityEngine.Networking.dll
    │   │   ├── UnityEngine.UI.dll
    │   │   └── XInputDotNetPure.dll
    │   ├── Mono
    │   │   ├── etc
    │   │   │   └── mono
    │   │   │       ├── 1.0
    │   │   │       │   ├── DefaultWsdlHelpGenerator.aspx
    │   │   │       │   └── machine.config
    │   │   │       ├── 2.0
    │   │   │       │   ├── Browsers
    │   │   │       │   │   └── Compat.browser
    │   │   │       │   ├── DefaultWsdlHelpGenerator.aspx
    │   │   │       │   ├── machine.config
    │   │   │       │   ├── settings.map
    │   │   │       │   └── web.config
    │   │   │       ├── browscap.ini
    │   │   │       ├── config
    │   │   │       └── mconfig
    │   │   │           └── config.xml
    │   │   ├── mono.dll
    │   │   └── MonoPosixHelper.dll
    │   ├── output_log.txt
    │   ├── Plugins
    │   │   └── XInputInterface.dll
    │   ├── Resources
    │   │   ├── unity_builtin_extra
    │   │   └── unity default resources
    │   ├── resources.assets
    │   ├── resources.assets.resS
    │   ├── ScreenSelector.bmp
    │   ├── sharedassets0.assets
    │   ├── sharedassets0.assets.resS
    │   └── sharedassets0.resource
    └── TheGreatDecay.exe