tl;dr: Fantastic. It's worth every penny even if you just put 2 hours into it.
This game is just fantastic. Super fun to mess around with. Sure, the designer takes a bit of getting used to, but if you're coming over from SimplePlanes or KSP it won't take long to get used to. For being in such an early stage of early access, the game has an amazing amount of polish. All the planets are super detailed (there's even a SpaceX style landing barge hidden on the Earth analog!) and the rendering is really smooth.

• Absurd amount of customisation, procedural parts stock, fully customisable paint
  
• Super detailed planets
  
• Great graphics for such low specs required
  
• built-in craft sharing and sandbox sharing, great community website
  
• Active, responsive devs who take suggestions.

• Not much information is given about your rocket in the designer (yet). Fixed in a recent update!
  
• Part collisions can sometimes be wonky, but only in extreme scenarios.

The sheer amount of customization you have stock is incredible, the possibilities really are endless. Plus, Jundroo's games have tended to be very easily moddable (everything's in XML), so the mods for this game are sure to be great. Their previous game, SimplePlanes, has a multiplayer mod, and a multiplayer mod for this game is already being made by a player! I highly reccomend this game to absoloutly anyone who has an interest in rockets.

Edit: New bug fixes and features are solving many problems I initially had with the game. Making it even better!

tl;dr: Fantastic. It's worth every penny even if you just put 2 hours into it. This game is just fantastic. Super fun to mess around with. Sure, the designer takes a bit of getting used to, but if you're coming over from SimplePlanes or KSP it won't take long to get used to. For being in such an early stage of early access, the game has an amazing amount of polish. All the planets are super detailed (there's even a SpaceX style landing barge hidden on the Earth analog!) and the rendering is really smooth. [h1] Pros: [/h1] [list] [*] Absurd amount of customisation, procedural parts stock, fully customisable paint [*] Super detailed planets [*] Great graphics for such low specs required [*] built-in craft sharing and sandbox sharing, great community website [*] Active, responsive devs who take suggestions. [/list] [h1] Cons: [/h1] [list] [*] [strike] Not much information is given about your rocket in the designer (yet). [/strike] Fixed in a recent update! [*] Part collisions can sometimes be wonky, but only in extreme scenarios. [/list] The sheer amount of customization you have stock is incredible, the possibilities really are endless. Plus, Jundroo's games have tended to be very easily moddable (everything's in XML), so the mods for this game are sure to be great. Their previous game, SimplePlanes, has a multiplayer mod, and a multiplayer mod for this game is already being made by a player! I highly reccomend this game to absoloutly anyone who has an interest in rockets. Edit: New bug fixes and features are solving many problems I initially had with the game. Making it even better!