Soffit vents on back and one side only?

New construction. Builder put in a sufficient number of 8x16 soffit vents, 9 in back; 4 on one side (other side is all gable). The 13 total is 1:150 for 3500 sq ft. Probably less actual square feet than that, maybe 3200-3300.

But no vents in front for aesthetics. Half of front is also gable. Is it OK to have the soffit vents only in the back & one side? In hindsight, should have asked for continuous soffits, but here we are. Thanks.