I thought this game was funny, creative, and very well-done! I liked the game mechanics, the little puzzles you had to figure out in order to unlock areas, and the uniqueness of each monster. The art and music were perfect for the game too.
Just some feedback on a couple of minor points: I got a little tired of pressing the space bar (particularly for one of the endings, but also while looking around). Without giving away any spoilers, I liked the fact that there was a hint when an object was examined early on; I thought that was more fun than inhaling everything while searching. I personally would have liked to have a separate button for inhaling and shooting, since I had to constantly shoot out (or eat) things before I could inhale again. Perhaps separate buttons might be useful in battle too, if being able to inhale stuff multiple times and then shoot it out all at once did more damage.
Anyhow, I thought this was a great game overall! :)