LMK,
Smoothies, purees, Boost, whey, shakes...all good options. Your question was "are they enough"? Short answer is, yes, with a good nutritional mix and fiber, and hydration of course. Max's recipes have been posted. You can also add ThickIt, cornstarch, flour, whatever to thin liquids if those are a problem.
At some point your PALS may not be able to handle these options either, but today is today. I don't see the need for a swallowing test or a special clinic visit, but YMMV and I would definitely get started on whatever recipes you choose, to see what works best. It is not just texture and thickness that matter, but also flavors and the order of presentation, e.g. acidic food like tomato separate from dairy and all that. Also, watch spices as some can be irritating even if they weren't before.
Depending on the type of gagging, semisoft foods like cheese, tender meat, canned fruit/veg, etc. can still be options. I'd stay away from foods w/ kernels like corn, peas, berries w/ seeds, even in puree form.
Not sure what pills you have been giving, but many are available as orally disintegrating (though even these often have to be helped along) and most can be crushed/dissolved in VitaminWater. Shorter-term, you may be able to give in applesauce, pudding or similar food, crushed or uncrushed.