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.
Hey, do you like games? So do we — that’s what makes Kongregate the best source of free games online. We have thousands upon thousands of free online games, from both one-man indies and large studios, rated and filtered so you can play the best of the best. Read more »