It took me awhile to realize what the different potions did, but I really like that mechanic. The game was super fast for me so I was running around collecting potions and sprinting away from guards that I couldn't read the text that popped up when I grabbed potions. Then in the level you had to be a ghost I finally understood what they did.
The mood was also good. I enjoyed the dark lighting and the urgency with your hearts constantly dropping. Nice job, thanks for sharing!