Finished this game. I think this is another very cool "loop to do something" game with a really unique twist. Making your sentries and their shooting pattern as part of your own movement looping is super interesting and requires a good bit of skill to do well. Once you get the hang of the mechanic it becomes really effective and satisfying.
I do think perhaps the space station should be invulnerable to friendly fire, and maybe also the main player space craft, the loop sentries should still take friendly fire.
Also in general level one is just way too hard compared to the later levels.
Overall, really fun.