This is a cool concept! It does a really nice job of combining both long-term planning (placing the thrusters) and quick reactions (activating the thrusters) into a satisfying gameplay loop. I had quite a bit of fun trying out different setups to get through the levels. The main issue I ran into was that the thrusters seem really difficult to control and predict. I think that it would make a lot more sense if the player object was a circle instead of a cube, as the thrusters didn't seem to spin the box like I expected and instead pushed it off to the side. I also had some trouble getting the tutorial to work, and I kept getting stuck at the part after you activate the first thruster and it tells you to use the rest (pressing control didn't do anything). Fortunately, the controls were pretty intuitive, and I didn't have much trouble figuring them out while messing around in the first level. Overall, nicely done! I think this idea has a lot of potential if you ever go back and polish it up.
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Thank you for the detailed Feedback.
The problem with the tutorial is, that he says press left ctrl but not how often. I hoped that by testin you could find out that you have to press it 4 times until you get the next step.
Anyway, thank you for playing and i'll try changing it how you suggestet (cause the sphere is a nice idea).