That's a great idea!
Right now, the only feedback upon getting hit were the hearts on the top-right bursting with goo...
We'll attempt to add it!
its always about about communication between game and player. Player do some action and it communicates with game. But if game is not communicating back player can have feeling that something is missing or off... I always tends to analyze which information is potentially important for player to be aware. For your game its all about getting damage