This was fun! You did an excellent job of gradually introducing the mechanics to the player before launching them into the full game. Requiring the player to collect asteroid cores and making the aliens passive until provoked are both good and unique ideas.
I liked the design of the controls, but having to move the mouse and actually click each button was very tedious. Perhaps you could "bind" the mouse buttons to each control and "press" the buttons on the panel when a mouse button is pressed.
Good work!