Hey, thank you for the video. When adding the attacks, even if you don’t have a lot of visual feedback (animations and such), perhaps a simple sound or camera shake or a flash animation would help you sell that the character was hit or hit an enemy.
If you want SFX, try these websites:
https://sonniss.com/gameaudiogdc https://www.zapsplat.com/?s=hit&post_type=music&sound-effect-category-id=