[UPDATE] GateKeeper

You could change the implementation so that these cubes use A_Warp to orbit the monster.

It doesn't appear to fix the issue. That and now by using A_Warp both cubes are no longer orbiting around the Gate Keeper but instead are fixed to the front-right side of it at all times. Though that could be my poor attempt to trying to get this thing to work. I can't figure out how to make this work so maybe we should forget the idea of having the Cubes as anything but simple decorations? Unless someone else wants to take a crack at it that is.

The A_Warp page has an orbiter example at the bottom, did you check it?

Just weighing in to say that any changes to this enemy are fine by me, and really any changes to anything I've submitted are also cool.

Wha-boom! Update time once again!

So, unfortunately, I am still unable to get these cubes to fire or spawn the dark lost souls without them targeting the Gate Keeper itself. So, instead, I came up with another alternative that I think is a good compromise. Make em go BOOM! Instead of firing projectiles, or spawning lost souls, they now have a small chance to explode. The explosion is half the default rocket damage but with the same radius. Additionally, it will also spawn smaller black clouds when they explode, making it not only a hazard but causing a bit of an environmental visual hindrance as well.

Any feedback on this update and any other suggestions are welcome and encouraged. Is this a good point to call finished or is there more balancing issues that could be adjusted or anything else? Let me know.

Download link has been updated on the first post.

I really like the idea of the cubes exploding and leaving black clouds around, and potentially limiting your field of view.
Before this gets aproved, check for white pixels left in the sprites, I noticed a couple of them in the smoke and the Gatekeeper sprites.

Updated! Please see first post for updated link.

I have gone through the sprites and fixed up the white pixels, as far as I could spot, on the Gatekeeper, Smoke, and Dark Lost Souls. Speaking of which, I have added them back in. I felt a little bad for completely getting rid of them before so I tried working with them again and somehow they are now spawning as the Gatekeeper's Children via being spawned by the Shadow Cubes. No idea how it worked, no idea what I was doing beforehand that wasn't making it work, but hey it's working now! The Dark Lost Souls also went through a few minor changes. Mainly lowering their health and attack damage for balance purposes. With the lowered stats I think they are now much more manageable, and I feel that having them spawn in passively is more fitting with the Gatekeeper being partly magical.

Updated