What a funny and pleasant site! I like the graphics and the clearly structured layout.
There's a little thing for usability you can do: consider a change of colour in the navigation on mouse over, maybe a shade lighter of the background or another colour for the link text. For usability reasons also consider to add title tags in links.
Technically there are several html and a lot of css errors. You should also remove the spaghetti markup code. The meta description can be 160 characters, yours is much shorter.
Even if your site is older than 3 years, it is still unranked. You should steadily work on link building. Consider to make some of the outgoing links such as to facebook or twitter nofollow.