Amazingly good. I do have a few suggestions, though. First, like kNIGHT0wl said, a slider to control how many ticks per second there are. It would truly help people who want to experiment more. Second, an actual import-export feature across multiple devices. It sucks not being able to switch to my laptop or a public computer and continue my progress. Third, a final fourth tab for who-knows-what. I have no clue what it could be for, but I'm sure you'd do something amazing with it.
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