If you want to go squirrel, I would seriously consider http://deckbox.org/mtg/Deranged%20Hermit. He works really well in a blue/green deck where you can keep bouncing him to your hand to play him again, avoiding his echo cost.
EDIT: http://deckbox.org/mtg/Krosan%20Beast is really good as well

Yeah, for casual it will probably be fine. However, if you want to go into some tournaments, I would definitely make some small adjustments.

Sooo, at a quick glance, I have noticed that you have a few cards that are a bit unnecessary. Stormscape familiar and phyrexian altar are good cards, but I don't think that you will end up needing them. Your mana curve is already pretty low, so I doubt you will have any problems with mana. Also, your deck is significantly more white based than blue but you are keeping the same number of lands. I suggest cutting down on your blue lands, adding more white. The statistics bar can help you figure out the perfect ratio.

EDIT: some spot-removal could be handy for when you are not facing pure aggro
EDIT_2: also think about your deck in terms of win-cons or win conditions. If your main win condition is to over-aggro someone, a good mid-range deck will take you out with ease. Try building it around a specific leader type bird with the others supporting him, not just a mass of creatures.

I have had this deck for a while, but only recently have I had an urge to actually play it. Any tips on how to make it better would be greatly appreciated.
http://deckbox.org/sets/580999