Pretty standard for what it is, not a lot you can say against it or for it. I think you've accomplished well with what you thought out. So, props to you and you're project first of all.
The game and it's few enemies are pretty easy, but understandably probably due to because it's not very long. A story would be nice, some of the abilities are a bit basic and could be more fleshed out like the shield and dash, but are fine within the game you've created.
The music got a bit repetitive but not too annoying and the puzzles are a bit easy but are fine filler.
Like I said I think with what you've got to show is perfectly fine, I'd really just like to see this be more fleshed out a bit more.
I think the only thing that I can really talk about is the QR thing. I think it feels not needed for your game with how it is >currently right now<. As someone who doesn't use QR codes, the, yes, small extra steps, but, unnecessary ones, just feels gimmicky for just really easy puzzles.
I'll be honest, I haven't played a lot of the classic Zelda games but if you had to whip out your phone just to get a very small basic extra reward that gives you the answer anyway, I think that takes the player's focus away from the game rather than adding anything to their experience and leaves them wondering ''What was the point of that?''
I can understand why you probably added it though. You probably thought it would make your game more interesting or add more depth and unlike others, I think this is a pretty good idea. But, switching to my phone and installing and waiting for an app feels unnecessary and not exactly fun when the end game reward is so very little and when I'm told blankly the pattern/answer for the puzzle. It's way too easy for a small reward that it makes it feel unnecessary if I'm told the answer anyway.
It doesn't help also when they're in plain sight when a puzzle itself that didn't need a QR could of been there anyway, maybe if the QR codes were hidden and a bit more challenging themselves that'd actually at least give a sense of purpose and fun for a scanner to be used. Maybe those puzzles could also be a bit more rewardful in that they obtain something you couldn't find in the typical puzzle giving reason for the player to be seeking them?
(Lore, special items, etc?)
Anyway, I thought it was pretty good for as is. I hope you continue with it or at least the idea or something similar. Thanks for sharing your game.