I love the working title!
The theme and setting def sounds creative, and the idea of battling on desktops is unique as well! I think this idea def has the potential to be pretty fun. Reading the GDD does sound like it might have the potential to have a bit of crunch towards the end, so def keep watching your time and add a buffer if needed!
Otherwise sounds like a great game and I hope to see what y’all got for the prototyping phase! Best of luck y’all!