Flash on Chrome jumped from 00% CPU, 15000K to 33% CPU, 75000K on my Quad Core. I had no other flash apps running. To confirm, I killed flash, then refreshed this page. Are you forgetting to release some dynamic memory?
My game started lagging when I got to the 40 slow weak enemies wave. It could be the several frost towers that slowed several down to 0.05 and made them clump =)
Momentum is good, but limits should be reset when jumping. (Try powering the train forwards, then jumping to next car at first interval. It`s impossible thanks to momentum and limits.)
Mattgo90: Every year, New Year's is around the beginning whereas Christmas is towards the end. In addition, a house with all walls facing south is possible (think of the south 1 mile -> east 1 mile -> north 1 mile problem).
lssixdotcom: No need for that language; you can ask more politely. (Press M on your keyboard. Geez, even you could've figured that out.) Gamerfreaks: saving them is easy; one of the humans got hit in my game but I still saved all humans and got the badge.
 "Snake"){kind=icon}
 "Pro game for Pro Gamers"){kind=icon}
 "Strip the Lady"){kind=icon}
 "My First Game"){kind=icon}
 "Fujitsu Defender"){kind=icon}
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 "Red Ball"){kind=icon}
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 "ProthoTest"){kind=icon}
 "Cartoon buster (DEMO)"){kind=icon}
 "Loondon"){kind=icon}
 "Genius Test 2"){kind=icon}
 "Robot Wants Kitty"){kind=icon}
 "Genius Test 1"){kind=icon}
 "Genius Test 3"){kind=icon}
 "ImmorTall"){kind=icon}
 "DuckLife"){kind=icon}