This looks like it could have been a cool game. And building your own engine is impressive (I often fall into the trap of customizing and building from the ground up as well, though I always start with a basic framework).
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Well thank you! I did start with a bit of a framework that I prepared ahead of the jam, but it mostly gave me access to WebGL, a minimal 2d rendering API on top of WebGL, and console.log. It’s also where I pulled the code for bundling it up into a standalone HTML file, though that’s more of a neat trick than anything at this point.