Some feedback as a modder of sorts myself:
Most likely real bugs:
1. The 3 hit (where 1 hit = 1 wood sword hit) green slimes break into little slimes, but the little slimes regenerate into 2 hit green slimes. Is either the wrong monster, or you did this intentionally to deter health farming.
2. Music levels do not match well at all. This is especially obvious for The Gauntlet and The Shadow Temple. I go from a happy game of Zelda to suddenly worried about pissing off my neighbors and blowing out my speakers.
3. Wind Robes on way to Shadow Temple warp you to inescapable area. Easy enough to use the F6 end game thing, but having to use that one isn't appreciated.
Now onto feedback that is subjective, take it as you like
:1. My favorite part about the original Zelda was only being able to carry 12 bombs, said no one ever. 12 bomb limit is just not fun.
2. Higher level monsters just can't be bothered to drop loot? It is fine if you want it to be rare, but when you have 2 items that actively eat rupees, the bow and the lens of truth, it isn't good at all. Leaving the ultimate dungeon to go on a Rupee farming mission just isn't cool
3. The flame boomerang's flames. These are terrible, bad, and should feel sad. They do something like .2 hits in damage, make the monsters avoid the stun you were trying to land. Honestly the basic boomerang, aside from not being able to stun certain things, is superior to this ultimate boomerang. I realize you may have imported it, but the flames are just awful. They could at least do red candle damage, if they must exist.
4. Dungeon tediousness. Ganondorf's final dungeon has nothing on your dungeons in terms of chances to redo the same 10 + rooms several times in a row. Whether it is a door slamming shut behind you, stairs several rooms back, or your WindRobe/Master Hand fetish, one way or another, the trek shall be made again. The design is actually fairly decent, but you were far too heavy handed with back to the start measures.
5. Ganondorf, optional? While this is technically true, you get punished rather harshly for not taking him out, especially if you enjoy having sanity in the Shadow Temple. In fact, this is a bit of a recurring theme for the map, you typically can only get so far doing dungeons out of order, sometimes literally unable to move without the magic piece. So you have to revisit dungeons sometimes, but still forced to do things in a certain order. Too many bridges needing repairs!
6. Step ladder functionality is lame, I know there are ones that let you go any way you like after first stepping out as long as it is within reach. This may have been intentional to make certain rooms more difficult, but the original ladder functionality of getting stuck due to the ladder is not fun.
Any who, should be proud of the quest, just some honest feedback for you there
Hope the next one is even better.
