ShadowBlaxter beat me to it about Desert Strike. Used to play for hours on that and I spent quite a bit of time playing your game. The game does freeze up on the first missle launch, is a shader being used? that happened to me before but with newer godot can do that shader preload thingamajig, sorry i don't know the term can fix that, if not would need to roll own preloader.
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ahh yes, i've had that before and that will cause a stutter, that can be remediated by preloading the particles as well, i saw a FireBelley video of his preloader that accounts for particles, i think, don't quote me on it, the 4.5 shader baker thing i'm thinking of doesn't do particles, i could be wrong though