I really like this, I'd love to know how you made the whole excavation system, because that's awesome!
I like the whole go for other explosives and attach them to the bomb, the whole high-risk high-reward is cool, though I feel that concept could be expanded further and be a lot of fun!
I did sadly encounter a bug where you got stuck on the wall :[
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The excavation system is a giant mess but at a high level it's really simple. There's a big 2d array of densities and then some functions loop over every single triangle, average out the densities to determine which ones are air, and then creates a mesh for it. When you excavate it loops over all the points and sets the nearby ones to zero density before running the entire mesh generation algorithm all over again, instancing new physics objects if there's no longer a triangle where there was one before. It's horrifically inefficient but just barely performant enough to work