Absolutely delightful game. I'm stuck unable to figure out how to make antimatter, but I've had a great time playing so far!
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Hey, thanks for playing, I'm glad you're enjoying it!
If you need a hint regarding antimatter, take a close look at the Orvel System, you might be missing an object close to the black hole. You should also be able to use the button with the binoculars at the top right to locate it.
If you have already found it, you will likely need to progress the research tree further, look above the "Long-Range Comet Rail Node" project. This should lead you to the buildings and unlocks you will need.