The music was great :D! And the pixel graphics were pretty too :), although they made the text a bit harder to read.
I found the UFO very slippery and hard to control. Most of the time I found myself flying on the bottom of the screen, which probably isn't the intended experience :D. Both UFO and grounded had huge and unforgiving hitboxes, making the game feel a little unfair.
But other than that, it's a nice game :). Beating the levels felt rewarding :D. Good job!