This was great fun! I don't normally enjoy puzzle-oriented games, but even though this one is pretty much pure puzzle, I liked it a lot. I've not previously enjoyed games with very tight timing (for example A Change in the Weather), but All Things Devours gives plenty of feedback when your plan goes wrong, so the level of unnecessary frustration is very low.
One criticism: I would have preferred it if the hints had been included in the game, rather than placed on a website — the URL given in the game doesn't work (the correct one is http://www.amirrorclear.net/flowers/game/devours/) and so I ended up hunting around on rec.games.interactive-fiction instead, slightly spoilering myself in the process. I would have given this game five stars if it had included an integrated hints system. (NB: I did inform the author of this problem, and he's going to see if he can get the URL given in the game working again.)