That was awesome. The gravity fed inventory was cool, and the rune combining had a really nice arcane feel to it. The atmosphere was really nice too, the music added that extra touch that made it really feel like a polished product. I also felt like you balanced the rpg vs puzzle aspect really well. Resources were fairly prevalent, so there wasn't any time when I got softlocked or anything, but I still had to think about resources management. I dunno if this was intentional, but I got flooded with a lot of life from the shopkeepers, so I was running low on air a lot, which made me tend to use the attack rune against enemies more than the other runes because I knew I could take the damage and I didn't have the runes to spare. Which was awesome, it's amazing that you managed to fit that much depth into the resource management system.
And holy shit, did you just make an old style blobber (except without the blobing of course)? That's amazing, I thought people didn't do those anymore, bar some notable exceptions.