Wow. Not bad for your first Jam here! Great solid work. You had a good flow in the songs. A good moving theme. And the music kept moving! And I totally could hear the spaceship taking off! Solid work here! Keep at it. You will learn and improve with every song you make.
For feedback, maybe you would want to vary the instruments used? You used the same ones for each song and they all sounded pretty similar, which is not a bad thing, but each song could sound more unique with a different lead instrument.