He’s using the Charge Shot right now, but he has other types.
Charge Shot
Normal- Shoots rapidly straight ahead, creating a small shock, just not electrocution.
Charged- Shorter range, but creates a small explosion of electric energy.
Peashooter
Normal- Normal Blue dots of energy, burning a little.
Charged- Slow moving blue ball of pretty much fire.
Spread
Normal- Just like peashooter, but less range, and there are 3 at a time, spreading out.
Charged: Shoots 8 large spikes of energy around himself. This can be one of his most deadly ones.
Roundabout
Normal: Blades of energy, cutting through things, before changing direction and flying back to Cupheads direction. This is a risky one, since Cuphead has to dodge away.
Charged: The same thing but Larger, and can return to Cuphead for more energy.
Chaser
Normal- Homes in on nearest person, doing less damage, but have the same burning effect as peashooter.
Charged- Summons 4 blue energy balls that circle around Cuphead. They can be destroyed by other things though, but they offer protection for Cuphead.
I didn’t include 1 or 2 of the other ones, and tried balancing out as much as I could. I’ll put down when he changes weapon type. But, he has the top one on right now. Hope the chart is somewhat helpful, I tried.