love the thin pulse leads at the start
really need to hold off the kicks towards the end of those buildups. that first on beat after your buildup has to be immense; the continued kicks through that filter sweep are too predictive of that first kick in the next section so there's not as much anticipation and not much energy once you're out of the build.
not a fan of the really brittle backbeat sound either, got that big kick but hardly any snare.
all the melodic and complextro elements are kinda way too loud and the kick doesn't really seem to cut through it. the super saws are way overpowered!
so it does the whole slow down thing but i feel like it comes in way too soon, like you could've kept the straight dnb rolling for a lot longer. the buildup is nice but not really feeling the transition into the next section, again it doesn't really have that anticipation. as you say, the ending is kind of an afterthought. kinda dumb to do when you can just as easily end on a kick/crash/boom combo - sure it's cheesy but as far as abrupt, undecided endings go it sounds pretty good!
overall, really good sound design on the individual elements but the mix isn't super tight yet. structure is nice and different but needs a few variations in arrangement/dynamics carved in to make the transitions really moving. also maybe some more structural repetition?