So, I'll start off with: WOW did I absolutely LOVE Rubia! It was the fourth modded planet that I visited, after conquering Cerys and Moshine, and deciding that I wasn't in the mood for the hyper-Gleba that is Janus, I went to Rubia.
Being the achievement hunter that I am, I also made it 'engineer must die' mode. So, after making the trip, I saw a warning saying that I'd die if I did the drop. So, I went to Fulgora, got 5 epic T2 shields, and went back. Aaand then turned back to Fulgora. Attempt 3 had me kitted out with 18 epic T2 shields, to which I was told I was "almost ready". I decided I wanted to see the death anyway, and sure enough, I died on the drop! The fourth attempt and 20 epic shields did the trick.
So, that was a (somewhat annoying but intriguing) sidequest, (we'll skip over the fifth journey so I could bring along my roboports. I'll keep my left leg thank you very much :). Now, Rubia itself. Wow. Inserters only being able to go right was a massive change in thinking. Along with belts not being able to go left and splitters only to the right made putting things on the other side of a belt often cost me a tile of space (not always, but often).
But even before that, the sheer struggle to get a foothold in was awesome. Getting the thought of "but fluids can travel left!" was huge and was what let me actually get started. A tank to hold the sludge (cause my pumpjack was not in the zone of protection) and again, an (awesome) struggle later, my base was started up and running. (ended up ghosting the whole base and speed building it with bots, then priming the turrets. Couldn't think of any other way..)
Anyway, that story of how I started to conquer Rubia, the main gimmick of only be able to build right was super interesting. The constant bombardment of trashteroids leaves me now with gun turrets (in at least double lines!) everywhere across my base (probably wouldn't need as many on the other difficulties, but I enjoyed it).
The random lore tidbits you sometimes get when collecting junk piles was also cool. Though I didn't get a lot of the references, those I did I laughed at. And just as it was started to become a drag, I got the last one, so that was also cool and good.
Anyway, this was long winded cause I ended up sharing a whole story, but yeah, 10/10 planet, great job, super interesting mechanics (in that the gimmicks forced me to play in a style that is not my usual, but isn't brain breaking or frustrating). Would Rubia again.
Other tidbits I enjoyed:
* Not being able to just drop in a truckload of supplies (I enjoyed Cerys for that reason as well)
* Being given T2 speed mods so I couldn't craft T3 assemblers right away
* Being given bots from the junk piles
* Being told in the tips and tricks that I could feel free to explore a lot of Rubia's surface (like, seriously. Thanks for saying that)