DNA Replicator

This is a cheap clone of Dance Dance Revolution, except instead of dancer, you are a molecule of DNA Replicase and you have to successfully copy a gene, otherwise the consequences for your host will be very bad. And, instead of a dance pad, this game uses "thumbs", except it's not thumbs but fingertips here because it's a keyboard. The basic gameplay is this: stray nucleotides will float up from the bottom of the screen until they hit a certian obvious horizontal location; at this point, you have to grab the nucleotide and add it to the DNA that's spiraling by. Your timing must be very good. How do you grab them? You must use the vi (Very Intuitive) direction keys H, J, K, and L to grab the appropriate nucleotide. (It's pretty obvious once you see it, especially if you've played DDR.) You can pause with spacebar. If you're wondering which nucleotide is which: red is adenine, blue is guanine, yellow is cytosine, and green is thymine. Knowing this has absolutely no effect on gameplay.