Zandronum

1. Can someone identify this game;
It was like Quake 3 but more colorful, like in C&C Renegade.
There was alien-looking monster, weapon similar to Thompson exept it shot blue laser beams.
I guess it is made 1998-2002
I know that this ain't lot of information, but give it a go!

2.Why in the hell Necrocide was cancelled? Would have been epic.

Alien Arena...?
No idea to the 2nd question

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No, it has much lower quality graphics, like in belowe, maby a little lower quality, and it was SP.
[spoiler][/spoiler]