New animals, new blocks and new utilities!
I think you should add ovens. The oven can be used to cook food that you get from killing animals.
Stairs are also nice, even though they serve no purpose beyond aesthetics.
The last "block" (it's actually two) is the Rubber Tree. It gives you rubber if you break it's trunk and leaves. The rubber can be used to make flippers for swimming and also to make cool looking raincoats and rainhats. If you craft 200 rubber you get a rubber dummy that you can place and attack with swords and guns. The rubber dummy is indestructible!
The animal ideas I have are:
Cows and goats, which give milk and meat. However cows and goats will also attack and ram you with their horns if you damage them, dealing 1-3 damage each time.
Chickens and ducks, which give eggs and pieces of the chicken. (breast, drumstick, wing etc.) These fowl creatures will actively attack you. Chickens are particularly evil and should not be trusted.
To prove this, a quote! "I think Hitler was a good guy." - a random chicken. Stereotype you say?!! NO! (what? I'm rambling? Ok back to the idea..)
Mosquitoes and gnats, which have a 50% chance to dodge attacks and can deal 1 damage over time. These insects drop nothing :'(
Bee hives, which give honey and release a swarm of bees if you attack them. The bees deal 1 damage and have a 25% chance to dodge attacks. The bees also randomly drop honey and bee babies which give you a bee pet. Bee babies 0.1% chance of dropping and honey 50% chance of dropping.
And pigs! Tasty omnoms that only serve one purpose: MEAT. TONS of it. Killing one pig will give more meat than killing 3 cows.
And now for new items!
There is the bucket, used for getting water from lakes, ponds etc. It can also be used for getting milk from cows. The bucket is crafted by 50 wood and 1 LawyerCat tail.
There is the fishing rod, which you use to get fish from water.
and finally there are flippers, so you can SWIM! YES, SWIM!!!
(You'll still drown eventually...)
And last but not least, you can craft armor from 100 pieces of half-block wood. Crafting this armor will give you 1 protection from every attack except attacks of 1 dmg. You can only make a chestplate out of the wood and can craft it anywhere.
(The crafting menu should be a submenu of it's own, and all the recipes should be shown.)
This game would be fine without crafting. Even more stuff to grind for isn't that good of an idea.