Put download buttons above the fold
No navigation buttons
Animated GIFS
The main purpose of a landing page is to take action.
If you pay for ads, the ads should point to your landing page, you want the user to install the game
Examples
http://haydaygame.com/
http://asherv.com/threes/
http://dev-ice-software.com/butcher-testpage/
http://ridiculousfishing.com/
http://broforcegame.com/
http://www.monumentvalleygame.com/
Execution
Templates
https://github.com/krzysiekpiasecki/ngNewAge
References:
https://www.youtube.com/watch?v=pF22UxpUCL4