It would be supper cool to debug CUDA with Luna, but keep in mind there is a really long way until it will be possible. It is however very interesting path and I'm super curious where it could lead us to! I'm willing to support it as I can if you would like to try do it by yourself. You will be even able to cut off our backend and use the GUI for your purposes, however more interesting (and even probably also easier) way to do it will be to make some abstractions in backend and build the graph using provided by us backend server, its API and replacing only the interpreter / compiler plugins. To sum this up, a very interesting idea!