I'm a Unity developer, and I'm using a plugin called UnityDog to embed the unity player easily in posts.
The size of the player is really important. Standard Unity webplayer is 960x600.
First of all that doesn't fit comfortably inside a standard post. Second I'm unsure as to how the game reacts on other devices, but it's not really meant to be played on phones as a web game.
Is there a way to put it in a standard post properly (right now it's sticking out the right side). Is there a way to lock it to the proper size?
You can check it out here. I've put it up password protected so it won't pop up on the site. Password is: unity.