My first thought after opening the game: Astro bears? Happens to have the same main menu music :P
That gameplay loop is really fluid, has a great sfx, and a massive enemy variety! Not only that, but all the enemies feel distinct!
A lot of fun to play, a really well-made highscore-based game!
At first I thought the concept was pretty similar to mine, but the gameplay ends up feeling really different - not in a bad way at all!
Great job, had a ton of fun with it!