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Thanks for your feedback! I made a simulation similar to this one where you can make your own reactions. Click on universe assembler and type something like 

p0 p1 -> p4 p5; 

That will turn type 0 and 1 into 4 and 5. So you can set all the reactions yourself. 

Download it over here:

https://buddhaman.itch.io/tims-insane-meta-universe