The owner can remove this if it's not needed, but here, we can put logical suggestions to improve the NPCs in THIS mod. If you want to post one for the Gonarchand company, go to the other addon. None of the following suggestions are needed, but would improve the npcs a bit.

First, The Alien Controller flies pretty slow. Not sure if this can be changed, but there are VJ npcs that fly much faster, like the Zerg Mutalisk, or the Turok Pteranodon. Controlling it is a bit finnicky, since his fight becomes stuttery when I try to get low to the ground.

They could do with some attack variety as well, like the homing orbs, or the ones that split and explode on the ground.

For the Nihilanth, he works really well, but he has a really hard time hitting stationary NPCs/players with most of his attacks. In Black Mesa, he hardcore punished you for not moving, so I think his attacks could punish you a bit more if you sit still.

For Phase 1, he could have the ability to use the Star attack, which he does use in the game. It's possible to replicate floating versions of the Blue Crystal devices, as I was able to do it in PAC3 (sorta)

His orange orbs should turn into 3 per shot In Phase 2, and fire those hand lasers with the Mouse 1. These lasers should punish you if you're only moving sideways. They could be avoided with diagonal movements.

The Telekinesis attack works really well, but he still uses it in Phase 3, where things get insanely hectic.

In Phase 3, his hand beams become really vertical in the game, but here, they could just be a basic cluster spread. The large circular shield seems to block projectiles, but is able to catch them and throw them back. That blue death ray he uses seems to bound to a different animation to the one that's used, and that's fine.

He does have that head-opening thing, but he seems to completely rely on the Fiery Death rain, and the rocks until killed.