I found the controls confusing at first, but after playing around, I realized you can control each ship component, like the thrusters and that they have their own default controls. That would be helpful to include in the game or the description.
For example, I attached a rain collector to gather rain for fuel and then attached a thruster. Holding down the space bar activates the thruster and this was enough for me to reach outer space.
I can see potential for the crafting aspect and given enough time, I might be able to build a spacecraft with stable controls and a weapons system. Some more guidance for players would go a long way, but there's more to this game than meets the eye. Nice work!