I liked a lot the visuals, and the gameplay is cool ! But the SFX are a little harsh, aggressive
Beside this detail, your game is really fun to play, great job :)
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You can use an equalizer (an effect) and make some frequencies sound lower in volume. Here i would recommand you to make medium and high frequencies sound lower, but you can test other frequencies
Or you can augment the duration of the attack, and add some release
A little bit hard to write it down haha
But i don't know how you can fix it without any daw...
A simpler solution would be to make it sound lower in volume