I took the plunge and yeah... very much just... ok.
It took me about 30 minutes to finish the game and watch the credits roll. There are three zones (each with a hidden "heart container"), three items (sword, hookshot, and pickaxe), three dungeons with three bosses. The overworld map is like 5x5 screens. This game is pretty dang tiny.
The pixel art is really nice, and mechanically the game works as you'd expect. Took a bit to get used to the sword swing / attack because it's hitbox is a bit off compared with Zelda. Music and sound effects were... okay but not great. Some of the puzzles are decent, and they did do well with the whole "you can't go this way until you get the item you need to proceed" thing.
After you beat the game, it unlocks a sort of "gauntlet" mode, where you're trying to get as far as possible in a tower of seemingly randomly generated rooms. Killing enemies gives you gold (which works like EXP), and when you collect enough gold you level up and choose a power up (heath refill, heart container, armor upgrade, etc.) which is kind of neat. However, this would have worked a lot better as a roguelike - sadly dying just gives you a "high score" based on how many rooms you cleared, and you get to start over from the beginning with no upgrades and try to beat your high score. I tried it once but didn't really see the appeal in trying it over and over again.
Not really worth the $8 asking price - if it were $5 or less, my opinion of this game would have been a bit more forgiving.
nintendoeverything.com
