Either don't give them space to camp, or stay out of the range where their options are particularly threatening until you find an opening. If they don't have a bomb, their options to cover boomerang are higher commitment and more vulnerable to dash dance, jump, cc, and/or shield. Expect them to want to pull a bomb relatively soon. If they do have a bomb, scare them into shield, and treat their up-b OoS like Fox's up smash OoS. They have no grab, so run up shield is also alright, and if you grab and they try to throw bombs, you can get a grab break, which could end disastrously for Link. If you're not in range to scare them into shield, try to avoid arcs where bombs can even be thrown by link, going under being vastly preferable to over, and somewhat to horizontal spacing.
Walk forward, shield (and act out quickly) or dash as necessary can deal with a lot, though a link that's always retreating can be harder to directly punish this way. Once you get him cornered, take advantage of his more limited options. He hates being above you, watch for an attempt to come back in first.
And yes, ftilt lets you swat his projectiles and not take damage.