Cool! What I didn't like is that the word is above the critters. It should be under them so that I can see the word early enough. The word being located above the animal adds false difficulty to the game. The game is nice otherwise! I wouldn't expect to have fun playing a game where you only type. The animals looked so cute! I almost felt sorry for killing them. The bonuses were super. The chain combined with the bomb is an unconventional weapon - it can clear the whole board instantly. Simple, but fun!
By the way, I managed to survive for nearly 20 minutes in my first game. Maybe you should make the game harder, it started to be a little annoying after a while...