What a neat idea! Congrats on the debut, Luke. When I got to that central entry, I smugly sat back. And entered MOUNT RAINIER. So what if it didn't fit? There had to be some rebus-y shenanigans, right? Some Seattle-ite I am. I wasn't aware that MT ST HELENS spread ASH into 11 different states — fun to learn!
As with any established theme type, it's important to do something new, something different, or at least incorporate snappy themers which add zing. Art must evolve or it dies. And I like what Luke has done here. Instead of just saying "Why don't I do a rebus with ASH squares?" he uses that fact about spreading ASH into 11 different states as a rationale. I like that step to go above and beyond. It would have been really cool if the eleven states had been incorporated somehow. Perhaps if 1A had been something like (WA)LTER and 1D (ASH)CROFT — a two-way rebus? Those extra layers are tough to incorporate, but how cool would that have been?
The grid did feel a bit restricted to me, so it wasn't a surprise to find out it was an 80-worder. I didn't mind that so much since there were still a lot of long answers, but the abundance of three-letter answers (25) did make it feel a bit choppy for me. Will typically doesn't allow more than 22-ish three-letter words in a puzzle, and for good reason. Each three-letter word typically has been used so much that it's tough to come up with strong clues for them (that haven't been used before). And to me, so much short stuff brings a feeling of inelegance, both by making a puzzle look constricted and producing a choppy solve where you have to switch from word to word more quickly. Subjective, of course.
A couple of rough spots, not surprising given the 13-letter central answer plus eleven instances of ASH. Even six-ish rebus squares can be difficult, so having eleven is quite the challenge, especially when you consider you can't duplicated answers (if you have ASHEN, you can't use ASHES). The NW and SE corners are where I'd expect to see some difficulty (considering they're the biggest chunks of open white space), and there are some chunky bits. By fixing ASHCROFT, ASHAMED, and TEXAS HOLD EM (great entry!) into place, you've constrained three sides of that subspace. Tough to fill cleanly from there, and OON / FLIC / AREOLE are not a great trio. I wonder if moving that first ASH square to the start of 5D would have been better (ASHRAM, A SHARP, etc.)? Leaving that long 1D unconstrained might have given better flexibility in filling that tough region.
Finally, some great clues. Luke's already pointed out the clever clue for NOOSES and LOO — bravo, sir! I also liked the one for EVEL, which had me thinking about Olympic long jumping.
Congrats again, and I hope to see more from Luke! BTW, Will recently put out a note that he's in greatest need of Sunday-size puzzles and non-rebus Thursdays.