Eh...
It was just a loop :P
You said you were inspired by XiaoXiao 4. Well, that game had a clear path through the level, and enemies who were more than copy-pasted Agent Smith lookalikes.
Plus, I discovered that all I had to do was press Tab-Enter to shoot the enemies. In some places, that was the only way to defeat the enemies before they did major damage. I mean, come on. They all shot at the same time.
I got a score of 200, going through the loop 4 times, before I got bored. I only stuck around that long because this is the same music used in Castle 3 - Part C, which was cool.