That worked! Just a typo in your command though.
So for anyone else having problems:
1. Download the .zip file into Downloads, and run it so it extracts NeuraQuarium.app
2. Open the terminal app, type 'cd Downloads' then press enter
3. Type 'chmod +x NeuraQuarium.app/Contents/MacOS/NeuraQuarium' then press enter
4. Close terminal and click on the NeuraQuarium app, you'll get a security message
5. Open your System Preferences and select Security and Privacy
6. There should be a section saying that NeuraQuarium couldn't be validated and give you an option to say "Open Anyway."
You're in.
Hope that's helpful!!