Hi there! I'm on Windows 10 and trying to install the game within the itch.io launcher, and I'm having the same issue the other person was having. Sorry such a belated reply, but I've just discovered this game via an old post on PCGamer's Free Game Of The Week. Looks interesting, and hope I get to play it! :)
I did try to download it without the itch.io launcher. When I do, and unzip it then click the exe, it claims that windows can't access the file, and that I may not have appropriate permissions. However, I'm on the admin account. Then my anti virus (BitDefender) flagged it as potentially malicious and removed the file to Quarantine. I removed it back to the original folder, and was able to run it then. However, it was full-screen with no option to exit or play it windowed. The dot dot dot (...) did nothing when I clicked on it. I could only move within the dungeon. So I hit escape, and it closed the program. I imagine the antivirus may be something po6llnu was also dealing with as maybe that's why we couldn't run it from within itch.io's client? Thanks for your help! Edited to note that it still doesn't work within itch.io client, so maybe that's not why.
I'm glad you managed to open the game :)
I think the game worked well when you played it. There is indeed no windowed mode as well as exit button (sorry about that), and at the start you can only move around the corridors until you find things and use your mouse. (the dot dot dot button as a very small effect, you may discover it later)
Thanks a lot for the feedback, it is really helpful !