Ah, thank you for your kind comments.
The lots of bullets on screen? In the original SEUCK engine it was very limited. I used the SEUCK Redux framework to enhance this game, which uses a sprite multiplexor that contains 32 sprites. SEUCK users may find the framework source beneficial for enhancing their game creations - although a lot of coding knowledge is required there.
Some people loved the title music as it sort of reminded them of the title music of the game DJ Puff. - Although the title music in Bubble Duck is clearly not the same :)