HL vs SL

Hi, my school is part of the IB curriculum, and for all science classes they offer IB HL, IB SL, or standard level. Would top 20 engineering schools expect you to take all HL courses? Last year as a sophomore I took two HL science courses and found it difficult so as a junior I took two SL (physics and chem 2). Would colleges think poorly of this decision? I am still taking HL math, HL history, and HL english.

Thanks