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Do you keep the screen constantly on (with dimming but still on)? I had the same for a thermostat I made and the pixel burn on those screens are terrible. I would add offsetting to mitigate it. (Periodically render stuff with small random offsets) kudos!
So files with indexes... so storage devices with a file systems... so... so bits of information...
"Code heavy" of course in a relative sense. You can definitely make a snake game with the same aesthetic in less that 158 line, and you won't need to carry along the engine. I would also argue that the plain javascript version will be easier to understand as you will not need to understand what the engine is doing.
I find that any game created with this game engine ends up being far more code-heavy and complex than it would be without using it. In my mind, this invalidates the argument of using an ultra-minimalist game engine at the first place...