Played for 50 minutes. It's very much an upgraded Gameboy game; combat is super simple and just involves movement and swinging your weapon with X. O triggers whatever item you have equipped. R1 + pyramid, box, or hoop triggers whatever item shortcut you have tied to that combo, which is convenient because in the original you had to repeatedly go to the menu to switch items all the time. Since you have items like keys and mattocks (picks) that let you advance, the shortcuts are nice since you can keep moving without having to hit the menu constantly.
There are a variety of enemies even in the first hour. The vast majority of them so far hurt you simply by contact and don't have an actual attack other than walking/rushing at you. I've seen one enemy type that throws knives. Some enemy types are immune to weapon damage and can only be hurt with magic (which I don't have yet, but I've got a red mage companion following me around who can hurt those.)
Leveling is pretty quick. I'm already at level 9. Each time you level up you get a choice between 4 class types for how you want to level; if you choose warrior str goes up 2, vit 1, if you choose mage int goes up 2, wis 1, etc.. So if you want to be very strength-focused you can do that, alternatively you can build a character who is better at magic or has a lot of health. It's not super sophisticated.
There is a built-in map. It's not super complicated, it just reveals an outline of where you've been so far and lets you mark spots or check to see where various locations are. The game is like the original Zelda in that you explore a small area at a time. When you walk into an area the enemies spawn. You can either kill them all or just move around them to continue on your way. If you kill them and then move to the next map, then back, the enemies respawn. Map transitions are quick.
The game is also like Zelda in that it doesn't hold your hand. Right now I'm in a march cave trying to find a magic mirror that I need in order to rescue the princess I was accompanying a bit earlier in the game. I've no idea where the damn mirror is. I thought I'd fully explored the cave but I must have missed a hidden wall or something so I'm going to have to go through it more carefully; the game doesn't give you any "Your item is here!" assistance like modern titles do.
The game has save anywhere and lets you switch between the original and redone soundtracks (the redone soundtrack sounds great.)