Hello there everyone!
We here at Lemon Curd Games are terribly sorry for the inconvenience, but as the steam user Riedy guessed in their review, we're having issues with Steam. We launched the game at 15.00 Swedish time, Steam confirmed the launch and my Steamworks page tells me that it's available, which isn't entirely correct.
But Riedy also posted a method which has been found helpful by many and I tested myself. So a huge thank you goes out to Riedy for their help! I'm basically reposting Riedy's tips here to make sure that as many as possible see it, but again all credit goes to Riedy for helping us out here.
1. Make sure that Steam is launched and running on your computer.
2. Press the Windows key and the R key. This will bring up the command window shown in the picture.
3. Replace the default text in the window with the command line as in the picture, then press Enter. Here's said command line for your convenience: steam://install/949370
Now Steam should give you the ususal option of under what directory you'd like to install, just as if you had used the normal Store.