That's it. Just add your own boss ideas.

Add `Mecha Bouncer". Here are a few some things for the boss

Design:

Head:

A round mecha Round thingy with Saws for Eyes and Spikes around the round thingy BTW

Feet:

A Spring Which is more Improved

Movement:

Bounces Around Towards The Player and stop for when his attacking(Except the `Stomp Attack")before jumping again

Attacks:

a-Shooting Pellets: After jumping a little times. It will shoot a few of some pellets in 4-8 and then Bounces Towards The Player

b-Stomp Attack: Sometimes, The Boss will jump up and try to crush Carbo

c-Move Head: Will move his head towards Carbo to try hit Carbo but then removes the spikes but then put the spikes on his headand his head will be put back

How to defeat Him:

To defeat him, When his detaching his head to defeat you. He removes his spikes and you must try jump on his head or use a Power-up(Except Ice) towards him before he puts his head back in order to damage him!

When defeated, he will detach all his things and then his spikes and spring  explode including head. If an iten is placed inside him e.g: Key. His head will show the item when it explodes!

Here is the Boss. Think is Nice ;)