My idea is that when creating units, you can add other ores to make some "special units", or at least special bullets/effects depending of what ore you put in the factory.
For example, pyratite would make bullets inciendary (or explosions spread fire (crawlers)), and blast compound would make the explosion radius bigger (crawlers), or death explosive.
I like the idea of Incendiary Crawlers. If not a variant, there should be a bigger version of the Crawler that blows up into Lava
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