Hi Lumora, if your device is running Windows or Linux then you should be able to download and play by following the instructions on the downloads page. If you are on an apple device then I'm currently working on building a Mac version, hoping to get it out as soon as possible!
If you still can't run the game using Windows or Linux, check out the bug report google form (link just above the comments) and submit a download query with some more info on the issue!