It's decent enough fun. A physics-based thrust/lander puzzler with an interesting mechanic, whereby you can change the design of your craft, affecting its flight characteristics and abilities.
I've played the game up to level 7 of the main "Adventure". It took about 4 hours and I think that's about half-way through the main arc of the game, but there is a lot of additional content in the form of single "challenges". The puzzles are not hard, but finding the right way to fly your craft or a combination of ship components that works to accomplish the task-in-hand can be tricky. It's possible (and recommended!) to save useful ship designs to recall quickly at the docking stations within the levels. All the levels seem to contain hidden areas with extra ship parts, which are rewarding to find. The game can get very frustrating sometimes, however, due to the physics simulation. It's possible to get your ship trapped in various ways, such as under a bit of falling or sliding scenery, or by having the wrong thruster in the wrong position on your ship, leaving you jammed up against a wall or spinning in circles with no way to get back to a base to change it, meaning you have to quit and re-start the level, which can be maddening, especially if it happens in sight of the exit gate!
I'm saying it's a 7/10 overall (but 3/10 when you get the damn ship stuck!).