Click the green flag a couple times to sync audio. Use the WASD keys or arrow keys to move your hero around, and press space to fire. The battle gets harder over time and the boss gets a new attack every 25 hits; and at 50 health, the boss will become more powerful. Pickups will appear as you progress. I fixed typos in dialogue, the invulnerability glitch and lag from the fire. Thanks to @ferstein for the original project and @Zhivaga for not really changing anything too major. The original game was created by @ferstein but he deleted it.