Is there an official place to discuss problems?
I also assume that the final editorial pass has not been made, so spelling and grammatical errors are probably out of bounds at the moment, right?
I've noticed a problem in taking damage on the personal scale. It looks like they start with CT "each D goes to a stat", but then conflage MgT's armor rules with it in a way that doesn't make sense. Either clarify how armor reduces the damage (all on one dice? Spread how the player likes?) and similarly how weapons listed as 3D+3 add the damage to individual dice, or drop the CT individual dice thing and just treat all damage points from a single attack as a single "hit".
They also don't address a character's age at the end of their career section. Others have noted
I'm personally not that excited about the super-high skill levels you can easily acquire, but in my heart, I'm a LBB1-3 CT character fan, so I wouldn't be.
I do like the more Mekton-esque take on careers and homeworld skills though. I think it might play well in this introductory set, and I'm rather tempted to use that system for CT and MgT. (MgT has homeworld skills, but I like Liftoff's system better.)
With the homeworld skills, you could conceivably play a useful character at age 18. Like Mekton, it might be fun to have a proper option to start off as the "young hot-shot" (just allow a "no career" career that gives you a little money and the choice of one level-2 skill maybe.)
(As a side note, I suspect Mekton was originally influenced by Traveller, but I have no hard evidence to support that suspicion.)
But all in all, I'm very enthusiastic so far. I don't want my initial complaints to come across as negativity. Liftoff has a lot of potential.