Hint for completing Micron level 49

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I would like to have some spoiler-free hints for Micron level 49. (Micron is a puzzle game available for Android, iOS and Steam.)
I believe I must hit all 4 switches at the same time in order to open the door. But I only have two simultaneous bullets. So I may need to "buffer" some bullets to release 4 at the same time. But maybe I'm just over-thinking.
Don't give me the solution right away! I want some kind of spoiler-free hint, just to nudge me in the right direction.
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5x5x5 49 : Mekorama story Level-49
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Images: Kelly, Lara Jameson, Ono Kosuki, Artem Podrez