BTW the weird spark wave attack is actually a gray spiny egg spawner attached to the birdo. But the gray spiny egg is invisible (one pixel wide graphics). And it holds a spawner shooting resprited smb1 hammers.
Screenshots:
https://app.box.com/s/kp09rpj1bx6ewkzliawco4dfi3v42ewg
And here is the one with the level itself.
https://app.box.com/s/bt6b11od513sdovc5e5jfsjpmaxelzr3