Thank you for playing! We're really happy you love it! means a lot! :D
1. We agreed! definitely need more impact for the player to add some satisfying feedback from the control! Actually, we planned to add some kind of screen shake whenever the player defeats an enemy, but unfortunately, we didn't have enough time to implement it into the game. So, we'll sure add it for the future development!
2. The idea of using WASD is for us to dynamically use other letter keys for future development, so other enemy possibly will be needing other keys to defeat. Maybe even words!
We really appreciate your feedback! again, thank you! :D