A very cool game, I absolutely love the graphics. The physics work great, and the sfx are nice. The only thing missing was the bg audio. However, I've had trouble with window size - it went nuts on my default resolution and was too tiny, had to change monitor resolution to play.
And it's really easy once you understand the AI. The AI plays very carefully, I won't even call defensive. Even a bit of aggression is enough to defeat it. And it seems both enemies use the same AI.
Otherwise - a really cool game, I enjoyed it!