Would have been more fun if this was part of a larger game, with actual stages and more boss battles.
This is quite easy.
Also, Venturesome, just avoid the lasers from the pearl til the attack stops. Then you can kill him.
The last badge really is just a luck one. Not really suitable for a hard badge.
I got stuck at it for a while because of spikes, then easily blasted through it during a test run.
That being said, great game. I quite enjoyed it.