Made this last year, inspired by @jart's SectorLambda[0] implementation of @tromp's Binary Lambda Calculus[1]. Since then I had an idea of how to translate the language into a 5-instruction "linear" (as opposed to tree-structured) machine code which can be nicely visualized. Finally implemented this idea, resulting in a minimal IDE/debugger. Just published a working version of that[0].
Pretty fun stuff. :D
[0] https://justine.lol/lambda/
[1] https://tromp.github.io/cl/Binary_lambda_calculus.html
[2] https://xtao.org/blog/nukleus.html