Microbe

.htaccess
<IfModule rewrite_module>

    RewriteEngine On

    # Maintenance mode:
    # An empty "/MAINTENANCE" file located at root
    # will allows us to load "/tpl/system/maintenance.php".
    RewriteCond %{DOCUMENT_ROOT}/MAINTENANCE -f
    RewriteCond %{REQUEST_URI} !^/assets(/.*)?$
    RewriteCond %{REQUEST_URI} !^/microbe(\.[^/.]+)?.php(\?.*)?$
    RewriteRule "^.*$" "maintenance.html" [L]

    # Forbidden access
    RewriteCond %{SCRIPT_FILENAME} -f
    RewriteRule "^\.git(/.*)?$" "-" [F]
    RewriteRule "^.*\.(txt|log|sql|ini|csv|tsv|json)$" "-" [F]
    RewriteRule "^(ENV|composer\..*|(LICENSE|README)(\..*)?)$" "-" [F]
    RewriteRule "^(ctrl|helpers|queries|tpl)(/.*)?$" "-" [F]
    RewriteRule "^vendor(/.*)?$" "-" [F]

    # Everything which doesn't exists goes to the index
    RewriteCond %{SCRIPT_FILENAME} !-f
    RewriteCond %{SCRIPT_FILENAME} !-d
    RewriteCond %{SCRIPT_FILENAME} !-l
    RewriteRule "^.*$" index.php [QSA]

</IfModule>