As far as second-parts of 2-part episodes go, that one stuck the landing pretty good. Lots to like in that one, some surprises, some non-surprises as well. Interesting to see the development with the Krill (and I wonder if next week will focus on the enemy they have and getting Union help.)
I thought the battle scenes were a little too cluttered and messy and there's not enough variety in the look of the Union (or Krill... or Kaylon) ships to really make much out but the battle was largely "secondary" to the narrative that was happening.
I also thought Yaphit had sacrificed himself.
And, hey, no "Reset Button!" (Beyond, thin excuses to allow Isaac to stay on the Orville.)
One question: Why are the [Jefferies Tubes] there if the entry points to them are too small for anyone to fit?
I guess they "could" be the climate/ventilation system, but some behind-the-scenes info on the show suggested the "atmosphere" in the ship was actually generated by oxygen-generating organisms built into walls and bulkheads and not by any central generation and dispersal system and the sides of the shaft looked to "complicated" and covered with greebles to just be the system of vents for any atmospheric or climate control distribution. So they must be work spaces... But with tiny slotted access doors?
In the end, though, very good episode. Look forward to where it goes from here.