Hi! Don't have a Mac to test on myself, but a friend who uses one had to run the following command via the terminal to get it to run:
xattr -cr Descend.app
It's apparently a common issue due to apps needing to be signed and notarised in order to run on OSX without additional steps, which requires a paid subscription to Apple's developer program. No worries at all if you can't get it to run - appreciate that you tried :)