Oh, did you get a lot of scraps with this strategy ? In my experience it does get you somewhere sure but the game difficulty ramp up in a way that it's hard to survive more than 20-30s like this
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in the first level yes, the enemies kinda just circled me too, so I just had to focus on shooting at the right time. I got like 1 ace upgrade and 2 normal upgrades or something. In the second stage it kinda worked, but then I though I'd stop cheesing and died quickly hahaha. It's a fun gameplay, even though I'm pretty bad at it xD