I'm sure i've already told you this, use pressurised water not falling water. And make it smaller so that there are less water particles and it runs faster.
The veins and arteries are completely different; one is thick and muscular while the other is thin. The blood moves through capillaries and the different parts of the heart have different sizes according to their job. The section of the heart that pumps blood around the body is a lot thicker than the part that pumps the blood around the lungs.
You need to do a lot more research on the heart before you make a second version.
Actually, this may stop you from making another but there were a few important principals to the game I forgot to mention:
-There needs to be a red on the same track as the one you control going slightly slower. This keeps you moving so you can't stop in one place.
-Every blue needs an escort, this follows the blue at the faster speed on the same track so you can't just wait in one place and eat all the blues
-Try to avoid the circle pieces, use rectangle blocks instead. The circle pieces slow the cars down as they are slightly thicker in the middle (my fault).
The result is:
-There are 6 tracks, 5 for normal cars and one for you
-The red on your track has to be slightly slower (the speeds are preset in the scene) or else it will catch you up
-The 6 tracks need to split up and join a lot otherwise the user gets bored
Add a killer rectangle only in the water collision menu. Then use a water spawner to provide the water. I've got one in several of my scenes, just set the motor on the water spawning device to constant and the water should spawn continuously.
A nice idea but poorly done. If you had actually scipted an engine that replicated an object that passed through the first portal in the second portal then this would be worth uploading but otherwise it's just a waste of bandwidth.
Apologies for not uploading anything in a long while but I ran out of ideas and have been working on an animation of Flash CS4 as well as playing GMod (if you like Phun then I recommend getting GMod). Find me on Steam if you're at all interested.