I don't think it is too narrow, not by the rules. Now, with all the corner combinations, Kymi Ring may "feel narrow", but I've no doubt it meets the 12-meter minimum, likely with a 15-meter-wide section around start/finish.
There are, however, a number of circuits in MotoGP that are, or I suspect are, more than 12 meters wide as a minimum. Sepang and Rio Hondo are listed as having a minimum width of 16 meters; compared to that, yeah, 12 meters might well feel narrow, but it meets the regulations.
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