Hah! I hear ya. The Kraken boss was made in like 30 minutes with only a few hours left in the jam. I am hoping to make it a bit more interesting.
Definitely want to add some screen shake and other "juice" to the game because I really want to finish the concept out. That and sound effects. That'll really help the game too. I know what the other three bosses will be. Just gotta make them! :)