NathanKuppek - Animals will never be added. You can make them yourself. And how will dirt work? Tiny objects that will take a really really long time to cover an area with? A better thing to do if you want dirt is just to put some solid ground (0 weight on an item, skinned to look like dirt), or if you want it to be movable, use skinned coal or potatoes. Plants? You can make them yourself (and you can spawn trees already).
Zabbyr, make them yourself. Just spawn in some body parts (search torso, head, arm, leg, hand, or foot), or spawn a doll and delete the parts you don't need and put the rest together. As tbear said, 0rava said he won't add them. (Why doesn't anyone read the "read this before suggesting anything" before suggesting anything?)
HeadRipper - Or, you could just hit the doll against the wall hard, then use the flame power. Much simpler, similar effect (except that you'll actually still have a doll to light on fire. Hitting a doll with a max size square just makes the body parts disappear, so all you'll have is a blood stain that you can't light on fire. Also, the gasoline is only necessary on non-flammable objects, but the dolls already are flammable.).
Suus - I don't kno which one you're talking about, so I'll tell you both. To get one ending, in the final level you have to get to the light beam. To get the other, you have to wait after reaching the spot that looks like the first level. Just wait for a while. Eventually the light beam will disappear, and you can walk through the wall behind and battle the guy talking to you. Bambo made a comment telling you how to beat him, if you get stuck.
Spfan4ever - What is ONE unit you can win ANY level with only ONE of? Spies can get stuck and would have to destroy blocks to escape, which thy can't. Bazooka soldiers, tanks, artillery, and rocket helicopters risk killing civilians (and VIPs, so you fail). The bullet soldiers... Well, they're just a bit weak.
This is a good game. Sad that the free demo ends there. (BTW, you should have put some kind of boss preview. After a short conversation, the first suddenly jumped at me and used a drill special, launching me off screen and it said "You have been deleted". I knew we'd fight, but didn't expect that sudden attack. It needed a preview so I'd know he could do that. Fortunately, I could skip to the boss after reaching him once...)
Zlaterboy, blue coins are worth more. I think the value order is this: Black > Grey > Purple > Blue > Yellow > Brown. I might be wrong, I haven't played this in a while (and purple coins might not even exist...).
Dragon_Night123 - You already can do that by skinning dolls, then using one of the many hats in this game to put on it. You can make the doll equips it by pressing F and clicking on its head, then putting the hat close. For a neater equip, pause and drag it to the head and weld (P) it there OR put it on the head without pausing and trigger the head to instantly weld it there.
Dragonborn - Make them yourself. 0rava said he won't add more dolls. If you want more outfits for the dolls, skin them and use breakables and similar items for details. (Use properties like ghost or unbreakable so they won't glitch.)
SciTech - Search "Rocket" or "RPG". You can also use "RPG Launcher" or "Grenade Launcher", in addition to several other explosives and explosive launchers.
GamerGirl - If you go back to the guy before, he'll say "I hope Elise pushes that mouse out the window", which is a hint - Search the mouse to find Elise.