Very neat! The only reason I wouldnt use it personally though is because I would feel like I am cheating on my survival world lol! The only suggestion I have is that Chrome on Android doesnt render the control panel correctly, it kind of cuts off the east direction button. Other than that it seems to work pretty well.
I had a side project that I posted about earlier where I made a Java API for analyzing and programatically modifying Bedrock worlds. I kind of geared it towards making it easier to do large redstone builds in Bedrock and specifically chose Java so that Java plugin development communities would have something familiar to work with.
You said you used Java to do this? Did you do this from scratch?