I played until I reached 107 seconds. The balance between the randomly scattered bullets and the bullets aimed at the player is well designed. I find myself playing it over and over again.
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Damn 107 seconds is good, my record is only in the 70s atm! I'm glad it's possible to get that far, I didn't manage to playtest as much as I wanted so those are uncharted territories.
All bullets are actually aimed at the player when they enter the field - it's just more obvious with the green ones as the red and especially blue ones are slower so you're generally somewhere else when they actually reach your previous location.