Move around using the arrow keys. Fight off the swarm by attacking by pressing z. Once you get to 10 points you can press x for a new move. Once you get 50 points you can press c. Once you get 200 points you can press v. Each have different special powers to help you fight off the swarm. If you fight off swarm 1, then after a short break, you will have to face swarm 2. Swarm 2 will take more health, but you will get more points if you defeat them.
Press the green flag twice for it to work better. I spent a ton of time working on this so I hope you enjoy! : )