Linking to this without the fennel-lang.org main page which states the following

"Fennel is a programming language that brings together the simplicity, speed, and reach of Lua with the flexibility of a lisp syntax and macro system." is a bad idea. Not having this sentence on your justification is ill advised.

Not to detract from the language or anything I have found many programming languages justification to just not have an elevator pitch and I have a hard time understanding why this is the case. Unfortunately people's attention spans are extremely short.