I doubt you did any damage. Depending on make and age it easily could have a shut off if the oil gets too lean. My 150 HP Suzuki two stroke has that feature. Most of the two strokes also had temperature shut down, even if it doesn't have oil monitoring, and too little oil will raise the running temp enough to cause that to shut off the motor.
You said the top of the pistons and plugs look good so most likely you didn't do any damage. Top of piston will almost always show damage before the bearings or rings have a problem.
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