good concept. however you need to work on a few things such as adding a boundary fully around the island or making it so you can swim. As a game on kongregate you should shoot for making 3-4 hours of content. The bunker and minigames are a good idea but the game was somewhat difficult because my mouse keept leaving the screen. Lock the mouse to center of the screen. Finally make a menu of some sort add a few features such as exit to menu and muting the sound. I hope that you improve on this game it has a lot of potential.
This game has potential I would recommend that you add a storyline, customize bikes/characters, and make the player character have a hit box. It gets annoying having to commit suicide by hitting the top of the bike in order to kill myself.
 "Survival Island"){kind=icon}
 "Supra Mayro Bross Lergend of the Mayro"){kind=icon}
 "Zombie Baby Biker"){kind=icon}