This game performs really well on my browser, so I'm going to disregard your friendly warning at my peril.
Deliciously good art going on here. As someone mentioned it's very Binding-esque, but I like that it's a bit tidier, cleaner, and friendlier in it's tone. The Anamita Muscara grows on my island, so it's a treat seeing it here. The lighting is really well executed, and I feel pretty compelled to hang out in the dungeon and spray mushrooms because of it. With a game that lets you talk to frogs, I'm not really sure it needs combat or violence of any kind, but the knight characters did add a nice bit of tension to the gameplay
As for critical feedback, I should say that it took me 3 or so tries to realize that I must exit the dungeon at the end. Wasn't a major hangup, but I definitely didn't consider the light as a door when I first booted into the game. Because the gameplay loop is a bit repetitive, the death on the 3rd level felt punishing enough that I decided not to go forward with the game further. With this kind of loop, I think it pays off to not have a too labyrinthian designed maze, which I think you mostly pulled off well from my experience that far.
Really really stunning artistic achievement here, runs well on browser after it loads, and I think this is a great idea.