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I would usually be sad to see another original RPG go 5e compatible but Neuroshima was infamously poorly designed ruleset, possibly worse than Shadowrun. I probably won't be running it, but may steal statblocks for my 5e game if I need weird stuff again.
Dear god in heaven - I'm pretty sure that applying percentages to a d20 violates the geneva convention.
Thanks for the horror story! What a cautionary take in how to destroy an otherwise serviceable core mechanic.