Much like bash scripts or python scripts, blz can contain a 1 line shebang at the top of the file to tell a shell which program to use when running the script.
Include #!/usr/bin/env blz at the top of your blz script.
Now you can directly execute the script from a shell, without including the blz command.
I.E. ./myscript.blz rather than blz myscript.blz