Thanks for your feedback!
The game definitely has a sound when you take damage. Maybe you played in silent mode on your computer? Maybe turning up the volume will help.
Regarding the enemies, if you are talking about bats, then yes, I think their design should have been changed.
In any case, I created the game in about 7-8 days and did not have time to work on it due to bugs and death display. I wanted to show the general concept, because bugs in such a short time are a common thing. Sorry if your experience was unpleasant.