Visuals
Absolutely gorgeous! Not only is the tileset very detailed, but the re-combination of the original graphics from the TloZ: Links Awakening + Oracle of Ages/Seasons add so much more variety to the landscapes, yet it preserves the familiarity from the original titles. The custom tilesets fit perfectly together and nothing feels out of place. Not to mention the variety of particles and light effects that breathe life into the environment. A very creative approach and great design decision. Not to mention the many other details like character portraits etc.

Gameplay Mechanics
Finally diagonal aiming with bows! Do I need to say much more? I will do regardless!
Movement, abilities, combat, interactions with objects/NPCs, the inventory/menu - everything felt smooth and fair. It was very exciting to see new enemies with their own little gimmicks, like the fish firing bubbles, which was also cleverly incorporated in solving a certain puzzle. Darknuts firing cannons?! Yes, please!

There was one tiny thing that bothered me a little at the beginning though. Link would jump down ledges way too fast and I can't recall how often I fell into water/pits and took damage/died by accident in the very first dungeon. But perhaps I was just a bit too clumsy, because I am used to the older mechanic, which requires pushing in a direction for a bit longer, until Links jumps down. It is a minor thing really and wasn't much of an issue later in the game.

Dungeons and Gimmicks
Again, very solid work. Themes are great with every dungeon having its own gimmicks. The player is not forced to backtrack for miles over and over again. Shortcuts are provided, where necessary.

When entering the Dungeon on Rotgrip Island (the one where you get the bow), one of the first rooms has unlit torches and two big holes. Once you light up the torches for the first time, spiders emerge from the holes. It's lovely details like this that really make a big diffrence and always drives a smile on my face when playing it. It fits so well in the theme and adds life to the environement.

Some of the dungeons felt a little bit too small (in particular the mentioned Dungeon on Rotgrip Island), but this is very subjective, of course.
For puzzles, they were mostly straight forward, if I recall correctly. Seeing some "brain candy" and more complex, thought provoking puzzles would be a cherry on top. Again, it's just a personal preference. The dungeons are fine the way they are now too.

Sidequest and Overworld
There are plenty of sidequests, hence the overworld is filled with many treasures to find. It provides quite a bit of activity and nice rewards on top. The encounters with different NPCs are entertaining, with each one having its own personality and story. What left the biggest impression was Impa and the tarot readings, with every new reading having its own animation. Really well executed!