I’ll give answering this a go. I am not associated with Positech in any way other than enjoying GSB1 (die hard fan), but I can tell you a bit about GSB2 in answer to some of your questions.
What’s changed between GSB1 and 2:
New ship classes: Gunships (heavy fighters/fighter bombers), destroyers (dedicated support vessels for large ships) and dreadnoughts (super-heavy weapons and carriers). The three previous classes (fighter, frigates and cruisers) remain - but their combat roles are clearer.
New ship behaviour: Fighters and gunships now require a carrier, rather than being optional and they need to refuel mid-battle. Shields operate close to the hulls - so no flying inside the shield radius.
New modules: Support beams for destroyers help push large ships faster, recharge their shields or other effects. Holographic decoys. Limpet beacons for anti-fighter work. New ranges of weapons like radiation beams, shield disruption bombs. Now weapons have different degrees of damage to shield, armour and hull tracked separately. There’s also different types of damage - explosive (standard), radiation, shield disruption alongside the existing EMP and ways of defending against specific effects.
Ship visuals: Now all player ships can be altered using the library of visual customisations. The included library of customisations is not huge, but that helps to limit how overwhelming the options are - but each element can be rotated and scaled and coloured. Elements can be rotated on the ship model (fans and radars). Ship lights flash as huge impacts land.
Complete graphical overhaul: The battles have depth - ships slide above and beneath each other. Rips in the ship’s hull are holes exposing fires beneath, rather than pasted on. More visual splendour - space scenery (asteroids) - lighting effects that can all be switched on/off as desired.
GSB1 and 2 don’t differ much in structure. You design ships, deploy them, detail your instructions, then let them go and see the result. Review the stats, make the changes to the fleet and repeat until success. Not much has changed in the order system - but I get the feeling that there are some interesting tricks and stunts you can pull with various combinations of orders and ships that are rarely explored by players. If you want to design, then plonk them anywhere and watch - that’s OK - but I think you can alter battle outcome through careful placement of ships and careful instructions.
The number of pre-defined missions in 2 is not as large as 1 yet - and there is no campaign mode yet. The challenges system looks neat, but has some issues which need work on (crashes and some deployment issues in Beta 1.15 certainly).
The game looks easy to modify in many ways and I think there will be a good modding scene. There’s plenty of scope for modification.
Game balance is a tricky art that is being worked on in Beta. There were some ways of breaking GSB1 with certain designs, which, when you knew the tricks, rendered the game a bit… mechanical and pointless. GSB2 certainly has much more complexity and the I am personally very happy that I don’t have 400 modules to choose from. Each hull has 20 or so weapons, a dozen defensive modules, half a dozen engines and thrusters and two dozen crew compartments, power plants, tractor beams and other equipment. Perhaps 70-odd modules for larger vessels - some of which are common to multiple hull types, but others can only be mounted on certain hulls - and some are race specific.
I quite like the softer, more cinematic look of the ship hulls - but your opinion may vary. Because Beta GSB2 doesn’t have all of the range of pre-defined ships that GSB1 ended up with, it’s a bit difficult to judge. I am not a huge fan of having to customise all of the ships, but each to his own.
The unlocks are there to ease new players into the game without overwhelming them with weapons and ship modules to begin with. I daresay the rate of unlocking will be tweaked through Beta, but you get access to all the toys pretty quickly.
If you ‘only’ put 30 hours into GSB1 - that’s quite a bit for the investment *8) If you loved fidgeting with designs and balancing interlocking capabilities - and always wanted to paint your fleets a particular colour, then GSB2 does not lack for interest.