itch.io

The game works just fine on Mac in case you wonder. The issue might have come from the fact that the app wasn't signed properly enough for Mac's security so by default it forbade it to launch. The "workaround" is pretty standard though: just a "chmod +x" on the 'ClickyCursors' files located in inside the app's 'Contents/MacOS/ClickyCursors' path. Not sure how universal this method is as I'm sure security varries between OS version but usually this works when running unofficial or unsigned apps :)
Sometimes, some additional steps are required, like doing a "chmod a+x" and an "xattr -cr" on the actual ".app". But it wasn't necessary here.

The Mac version can't even be opened. I had to do a chmod on the executable file inside the app package. Maybe add a small description on how to do it?

Yeah, one of the devs finally messaged me with this solution where you basically have to give it the correct permissions. The tricks in the download page is needed as well but not enough. Here is what he wrote me:
"I got it working on the mac (m1 air) using these commands in terminal:

cd /Users/MYUSERNAME/Downloads/Stacklands_v1.0.5\ \(macOS\)

(you can replace the thing after cd with wherever the .app is located in your filesystem... the easiest way is to type 'cd' and then drag the containing folder itself into terminal, it'll copy the path right in)

chmod a+x Stacklands.app/Contents/MacOS/Stacklands

xattr -cr Stacklands.app"

Hope this helps you as well :)

Impossible to even launch on Mac. Game is said to be damaged and should be moved to the bin. Any idea on how to proceed?