Fennel is a new programming language that combines the characteristics of Lua with a Lisp-like syntax and macro capabilities. User comments highlight the growing interest in Fennel, especially its applicability in situations where Lua is already in use. Commenters appreciate the flexibility of Fennel while also noting areas for improvement, such as the need for gradual typing support similar to other modern programming languages. Users have shared their positive experiences integrating Fennel with existing projects, particularly in enhancing customization and programmability. This trend reflects a broader movement towards utilizing flexible, dynamic languages in programming communities, promoting ease of use and efficiency in development tasks.