Just wondering, since I don't see any point in them, other than being fodder for transmutation.

So what was the highest level of ascension ever reached ? youtube isn't really full of video for this game, so information there is limited. and I'am currently at ascension 5, but I believe, I can go for alot longer, with proper grinding and maybe even strategizing, so what is the record for it ?...

They have so much health, and you can't slow them down at all. Literally the only way I've been able to beat any of them is hope that they get stuck on level geometry. I've used maxed out slime traps, barricades, ax traps, bolt traps,all with maximum upgrades, they are mildly inconvenienced and then walk into the portal. That is, unless they get stuck, then you can kill them. (Edited for clarity)...

I'm ready for one now.

I like Defence Grid too but this is great too and has more content.