They should throw in a song! Maybe something with lyrics like... "I'm just a Mana Altar, but see me power an entire chantry! You like the taste of blood, but we don't like enemies!" Yeah... it could use a little work...
Good animation, entertaining dialogue, a true RPG experience, absolutely fantastic music. One of the few games I've actually decided to rate, and 5/5 at that. Sure there are places where it could be improved, but that's true with anything.
Personally, I'd like to see a volume control. Sure I can disable the music and sound, but I do like it, it's just too loud when I'm talking on vent/skype while playing. Bonus/Post-Game content would be nice too, but this game has already surpassed what I've expected from a flash game.
Unique stuff, simple tool set, levels are sometimes a bit complicated, but they're separated into small enough rooms that they don't become too much to handle at once. Personally I found the second bonus room harder than the third. I'd suggest an optional hint section to help people get started on harder levels, as well as a level editor for a little personal fun.