it's missing something. It's fun for the most part. Frustrating but no sense of progression. I got to whatever level introduces the laser / key. There was some frustration with the skill curve. Raising the skill of the enemies but no apparent upgrade in abilities. That's fine but many of the enemies look the same so it takes a few tries to understand the behavior from level to level.
There is also a clear disconnect with the theme. After playing it, I read the document and the enemies spread a trail which then slowly shrinks. That interpretation feels like a huge stretch.
Also, reading the document, 52 LEVELS!!!!!! Sometimes more is just more. It's very long with no save system. Not a game I feel I could push through in one sitting without losing interest.
Overall, it's very polished, good gameplay, excellent arcade game but it feels like you put a lot of effort into the levels and a lot of them.