I sure do remember you! Good to see you again!

Feel free to chime in here. We're past the misunderstanding now. What did you like and what didn't you like?
Great!
OK, here are some thoughts that are ready right away.
As far as the positives go, in broad strokes, I was impressed with the animation, especially of the space creature. After reflecting on the different elements of the story, I have a sense of how it might fit together, particularly how all the various interdimensional elements might relate to each other. There are clearly some interesting directions this could go in, but I'll defer commenting on that more and on the story structure until after running through it again.
As far as the negatives go,
Maurice has already mentioned the pacing, which is something I noticed right off.
Here's a specific kind of problem that I noticed relating to pacing that happened many times: a character turns away from his or her station, replies to the captain, and then turns back to their station. That puts in two extra unnecessary beats every time it happens, the unnecessary beats being the turning away and the turning back. If you'll notice, on the original show, during critical periods such as during red alert on the bridge, the characters often talk to each other without making eye contact. For example, Spock will be talking to Kirk while he's staring into his scanner. Or, Sulu is facing forward working the helm. Sometimes the others will turn to face Kirk, but sometimes not. When characters are busy working their stations, breaking their attention away from what they're doing isn't necessary to reply to orders, and in fact you'd think it would be counterproductive. But, given that the characters do turn away from their stations a lot of times in your footage, to tighten it up, I'd suggest simply lopping off the front end of the footage of them speaking their line, the back end, or both, so we don't have to simply watch their heads turn, and wait for a head to finish turning before there's another line of dialog. It occurs to me that playing just the soundtrack with the video turned off might be a good exercise to help isolate these unnatural pauses in the conversations.
I'll try to work on getting more thoughts written down. Once again, Ken, I'm glad you finished this.