It is a BEAUTIFULLY designed Page. The Look the Feel everything is great.
Now lets Talk about Marketing
You need to Identify yourself (what you do) at the top of the page Navigation at the top really gave no clue. And my first impression was that your site was about lemons.
Also move the ads by google ot the top of the page, that's where tou need to shine, not your competion. Put a Description of your site in their places.
( Did I say I though your Design was beautiful? )
Now lets Talk about
SEO
I would change your meta tags from
<title>Welcome To ArcadeLemon</title>
<meta Name="Keywords" Content="Flash Games Arcade Videos Game Puzzles">
<meta Name="Description" Content="Play a huge selection of fun, addicting and free games for free
.">
to:
<title>Online Arcade Games play Free</title>
<meta Name="Keywords" Content="Online Arcade games,Arcade Games,online play,games,arcade">
<meta Name="Description" Content="Play online arcade games for free at Arcade Lemon. New Arcade Games arriving soon.">
Finally you need more text. At least 500 words of keyword rich content.
Anymore advice and I'll have to charge you ;o)
When Can I play