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There is a maximum width, which I believe is 800 or 900. There is no maximum height, but the general recommendation is to stay below 600px or you risk getting your game cut off if in some browsers at some resolutions.
And yes, you can link to kickstarter/funding from a game you made.
According to the [FAQ](http://www.kongregate.com/pages/help#format)
> games have […] a maximum width of 800 pixels. There’s not a hard height limit but please keep it reasonable to make sure your game is still playable.
**Edit** : Too slow, UG :)
It takes a simple look at the [FAQ for Devs page](http://developers.kongregate.com/docs/resources/faq#format) to confirm that the max width is 800px:
> Additionally, games have a maximum file size of 20MB and a maximum width of 800 pixels. There’s not a hard height limit but please keep it reasonable to make sure your game is still playable.
**EDIT** Ban Khronosis plox.