I haven’t seen official figures for Purdue engineering but the acceptance rate 2 cycles ago for engineering was 37%. They accepted fewer students this last cycle because they missed on their yield number the year before, so I expect to hear that the number is lower. It’s been trending down for years.
If Purdue stays on your list, make sure you apply EA. It’s the only way to be considered for honors college and the small number of merit awards. They also fill the majority of the class EA (non binding).