@Demented Sandwich The new guns and ammo, would make the game much bigger, leaving less space for other content. Also, lillejohn has said on his profile that he will not add a boat: he wants to make the players feel stuck on the island. Anyways. only one monster has a real head right now.(not including boss)
Some suggestions: 1)Weapon upgrades, like Aros said. 2)Ladders. 3)More types of blocks, especially windows. 4)Towns should be better defended. I once got killed at the town in the desert by a swarm of 10+ gunners. 5) A bestiary would be useful, if you're going to add more monsters. 6) We need a World Map. Maybe it could be bought in the shop. 7) Plot please.