I mean, you're thrown in there, with minimal instructions, the controls feel awkward till you get used to them, it's vast and sometimes lonely... Oh, and boobs.
Life is more interesting. (Badum, tsss...) Not that i have something against Zera, it just feels too much incomplete.
I think Zerahypt is in some kind of Alpha stage, in that it's still pretty raw and unpolished. Controls feel a bit clunky... and I guess that's my only major gripe with it (and I mention that, because I kile killing virtual things - and as the controls are currently set, that is going to be a bit hard)