I... fell through the world. It was an ultimate survival map. The one with the platform at the top right that you can only get up to with a jump powerup. I fell through the world on the bottom right when one of those flying kamikaze bots hit me. The bot disappeared, I got set to 0 kills, auto-swapped to five-seven, and proceeded to fall through the world. A few seconds of normal background and then... grey. Can't swap weapons.
Didn't even need to use freeze or bomb towers... that is to say.. I never used either of those towers. Ended with 26 towers and honestly think that with just 15 tack towers you could beat every level.
at the moment, i have over 1000 health and over 40k points. It is severely lagging now (the lag started at around 15k points). I can barely move the mouse to do anything and yet there's so many powerups spawning that i don't think I can lose even with the ball in one place. Going to leave this on in the background to see what high score it will get.
don't be so lazy with the buttons. You can hit tab and go through all the options. The way you have grouped things it's easy to see which is the real answer.
 "Dragon Sword: The Survival Battle"){kind=icon}
 "Thing-Thing Arena 2"){kind=icon}
 "Bloons Tower Defense"){kind=icon}
 "Bubble Escape"){kind=icon}
 "Caravaneer"){kind=icon}
 "Hard quiz"){kind=icon}
 "A Walk in the Park"){kind=icon}
 "Red"){kind=icon}
 "Marvin Spectrum"){kind=icon}
 "Skies of War"){kind=icon}
 "Potion Panic"){kind=icon}
 "Torque"){kind=icon}
 "The Fancy Pants Adventure: World 2 demo"){kind=icon}