I have some suggestions for stuff:
Weapons--
I-Enterhook
Suggested materials: 3 nails, 2 iron, 10 skin/cloth
Information:You can use the enterhook to enter a ship from your ship, or to pull the enemy ship to yours. This would make the ship battles more interesting
Suggested stats:none. Maybe make this a tool.
II-Double Sided Naginata
Suggested materials: 6 blades, 3 gold, 1 diamond
Information: Like the old naginata but faster and if you hit the same key twice and fast after eachother you get a double-attack.
Suggested stats: Dam+8
III-Musket
Suggested materials: 8 iron, 3 diamonds, 10 gold, 4 coal
Information: this needs gunpowder to use. Loading it goes faster then with pistols. It damages quite a lot. You also need bullets to use this.
Suggested stats: Dam+25 and -1 dam for each 5 tiles.
IV-Pistol
Suggested materials: 6 iron, 1 diamond, 5 gold, 4 coal
Information: this needs gunpowder and bullets to use. Loading it takes a lot of time, but this damages a lot from short distance.
Suggested stats: Dam+25 and -1 dam for each 2 tiles.
V-Scimitar
Suggested materials:3 iron, 1 diamond, 1 ruby, 2 gold, 3 blades
Information:Very fast sword but not great damage.
Suggested stats: Dam+6
VI-Halberd
Suggested materials:4 iron, 4 blades, 4 gold
Information:this is a big weapon with long distance, but heavy and slow.
Suggested stats: Dam+12
Item Suggestions--
I-gunpowder
Suggested materials:sulphur (new item), salpeter (new item), 3 coal
Information:used for muskets and pistols. The first gunpowder was cooked and stuff, so maybe make it something for alchemists
II-bullets
Suggested materials:1 stone 1 iron for 5 bullets
Information:used for muskets and pistols.
Misc. Suggestions--
A new island! This island would be way south and hard to find. On this items there are new, exotic enemies. Also you can plant new plants here, i.e. bananas, coconuts, cacao. Make it some subtropic island and with a big forest and mountains like the pyreneeans.
Enemie Suggestions--
I-Werewolf
Better version of the wolf. Looks the same but bigger and darker.
II-Imp
Annoying little creature that's in some haunted castle i want you to make

About as strong as dievils etc.
III-Gnome
Little guys with hammers that hit you, also in the castle
IV-Troll
Big evil enemy that's very strong, about as strong as a blue iguanadon or red rex.
V-Green Drake
Uber strong enemy! This guy could easily swap out a level 15. You also need other people to help you, as it is defending. This is the castle boss! You need someone to attack the head to distract him and some for the body. After some time he loses his armor, and then you can kill him. He leaves a greendragonchainmail or something, what provides the protection of a silver platemail (but ac+6), but is much lighter.