Characters!

Popeye. Main character controlled by player. His main purpose is to get into Olive's house heart.
Olive. Olive is desperate for love and starts waving around nervously if she doesn't get any hearts for a while.
Brute. Brute walks on start level and does not climb stairs or ropes. He does change depth so walking pass Brute is allways a hazard. When Brute gets Popeye he knocks him down and its time to use that spinach.
Crow. Crow flies on the same level as Brute but keeps to the most forward layer. Easy avoided unless Popeye gets caught in front of Olive's porch in which case there is a knock-out.
U.F.O. U.F.O. flies in middle depth and is not there just to put Popeye out. It is also very important transprotation device.
Witch. Witch also flies in middle depth and its only purpose is to put Popeye on his feet. Avoid.
Wasp. Wasp flies around light house. It was probably drawn to the light and it likes to be the only one there.
Dragon. Dragon is asleep unless Popeye gets too close. But the fire it blows can be neutralized.
Piranha. Piranha swims in shallow water so its tail can be seen from above. Its bite is deadly though.
Cannon. Cannon fires when Popeye delivers the fuse to it. Green shot is friendly and makes Popeye into a cannon ball.