one feature i like from this hack that most other hacks do not have is that many of the routes and places have items/secrets that hidden within boulders/rocks or require future visit with a particular tm/hm/other requirement. it rewards conscientious exploration.
difficulty wise its actually ok for a standard "normal" difficulty, though some of the gym leaders pokemon can have their movesets improved/tweaked better (like one poster mention before that 3rd gym leader pignite uses tackle, don't think gym leader pokemon should use such weak moves). of course another separate hard version of this hack would be nice.
siliglyph sprite looks awful...for space purposes draw it with its tail end folded up rather than that squished up body in the current sprite...
another thing i note is the lack of "attacking" TMs available early on. right up to the 3rd gym only such TMs i see are charming cry and return, then flame charge from 3rd leader... (i ignore cut and rock smash since they are crap). would be nice to see more decent TMs like thief, shock wave, aerial ace, water pulse etc distributed earlier on?