I played this for a bit, high score of 720. There are some nice features in here like procedurally generated levels (I think, or was it just a few different maps?) particle effects on the tractor beams, SFX. I appreciate the scoring mechanic too to encourage replaying the game.
I think a bit more of an overall direction would be cool, or even different levels with new challenges, but these can all be added post-jam. The colour palette I think could use some adjusting too, just so things look a bit clearer.
Overall a nice original idea, fairly well executed. Good job.