Thanks for playing hubs and juner.
I think my approach would have been to see how many interesting puzzles I could squeeze out of the existing mechanic. I really like games that can distill down to one idea and explore it fully. My go-to examples of this are Terry Cavanagh's
VVVVVV and
Super Hexagon.
I was pretty hesitant to even add the "hole" block. But I realized that only being able to do
size<x checks made the problem space too small, and there couldn't be many interesting puzzles. Holes allow for
size>=x checks, which opens things up a lot.
At least that was the plan. Knowing me, I'd probably keep getting wacky ideas and be unable to restrain myself.