THIS IS A REALLY OLD PROJECT I MADE SO THE CODE KINDA SUCKS! (might improve it soon tho ;D) The only real way to turn on 2x speed (or at least I think it's 2x speed) is by turning on turbo mode. Do this by holding "Shift" and clicking the flag. A remix friendly and cleaned up version of dagys' tower defense template. Nothing much was added except for helpful comments and cleaned up code to help remixers make a td (tower defense) game out of this template because the original had messy code and didn't explain much on how to make new towers or enemies. I also added some new sprites and mechanics that weren't in the original. Btw most of the sprites have invisible circles/rectangles around them so that they look better without fullscreen, you might have to edit them when making a new tower or something.
Remix if you want as it's the main reason this was made in the first place. Thanks to @dagys of course for the original project. Thanks to @TotalGolem for the coin animation. Your welcome, @dagys. Also, sorry there's no way to upgrade towers. You'll have to code one yourself :P