Good job! This reminds me a lot of a game I made for a previous jam (Stormlight Manor, I think you would like it if you checked it out). I like the idea of the timer for visibility a lot, and I actually think you did a really good job with the implementation of the pulse and the shadows. Only on the fifth level did I notice that the shadows actually prevented other meteors from showing up on the radar. I think the game is missing some sort of time pressure pushing the player to take more risks and play more quickly, because as it currently is, you have a strong motivation to just play slowly and only move when you can see. But aside from that, very cool!