Nice, simple game, but there are some bugs I encountered.
1. Around the 4th wave, one of the enemies wandered off the screen, and although the arrow can barely hit off-screen enemies, I was able to kill it and retrieve the arrow.
2. Around the 7th-8th wave, I lost due to a bug where I was hit while drawing the bow, and likely because I did not release the mouse button, when I got back up, I was not able to move, and the drawing animation looped until I ran out of time.