I had a lot of fun with this! For me, you had the perfect amount of attack patterns with the enemy: just enough to keep me on my toes, but few enough that I could figure them out quickly. That ball on the menu screen was a lot of fun, and part of me missed it in the main game.
Also, your game is the only one so far that has not been flagged by Windows Defender for me so... Congrats? Thanks?