Simple but cute space-invaders type game! My high score was 48. You've got a nice base to build off, and you could add lots of different mechanics here:
- Some lights drop power-ups like rapid-fire or a shadow beam
- A boss battle against a large light
- Have the lights shoot lasers back at you
- A clone power up to give you multiple shadows, maybe moving in opposite directions
- Hitting a close light casts a shadow which can hit lights that are further away
Most important thing is that you got a game finished and out though, great work :)