Hope you get a chance to try Spite! There are other hacks of Blame! but there's a fair complexity to them - at least with 24XX you can jump right in. Any feedback gratefully received.
the only ones I've looked at are Blam! v0.6 (https://rpggeek.com/rpgitem/301164/blam) and Evolution Pulse (a FATE based game, https://rpggeek.com/rpgitem/173168/evolution-pulse ) is pretty close. Blam! is good for mining ideas - quite crunchy. I've not really looked at EP in any detail.