Really fun! Haven't cleared it yet but I got to the final boss (I think). What tool did you use for the sfx? if it is something like bfxr... how do you make sounds that aren't annoying??
Thanks for the feedback (and congrats on the clear!). I made the sfx with https://pro.sfxr.me/. There are a few things I did to try to make them less grating: high pass and low pass filter to tone them down a bit and the repetitive sound effects all have variants (3 or 4 of them) and the game randomly plays one of the variants. This helps it be a bit less annoying.
Making good sound effects is something I’m still trying to figure out, it’s a tricky art!