You can find an in progress tree-sitter grammar for mlang here https://github.com/br4sco/tree-sitter-mcore. Contributions are welcome.
To use this packages it is easiest to install it via atoms package manager,
You can find relevant CTAGS definitions here https://github.com/miking-lang/miking-ctags.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.