Just tried the website version, similar issue occured I think you forgot to upload the game here is what is says on the website version "Nothing is available for download yet."
I don't 100% get the issue... I guess the problem may be that I set the game to "pay what you want", but if you don't pay at least the price of the GOLD edtion there is nothing available to download. The free version can only be downloaded via my website. I just tried it and it works. Just visit https://www.phodex.de/bladequest click on "Play Free Now!", enter your email click on Download to get the installer file.
Ok great :). I understand your objection. Some time ago I had the free version also available here on itch.io, but I changed that, as I now have my own webserver. Having everything on my own website gives me full control and makes it easier for me to manage files. I am thinking long term and I believe ultimately the user will also greatly benefit from that, although the website is yet very basic. So I decided to use Itch.io only as payment provider which it is very good for. But however I am experimenting around, so this is no definitive decision, I may change it again...
So, why not exactly have it here & on gamejolt? I feel like you still have control over your files, such as updating and or removing them like you, and also why not have in big text near the beginning that it is not going to be available for itchio or gamejolt? Would solve some confusing, and why not spread out your games to here, gamejolt and steam? I don't get why your having it for your site only, instead of spreading it to popular sites like this and gamejolt. Sure, it may be easier for you to control your files, but your spreading yourself thin, no offense. Just some of my thoughts on your reply.