Alright, I went to give it another go and saw you had a desktop build so I went for that and it worked.
So for feedback more relevant for the gameplay, now that I can hear/see the next wave thing, I think similar to the death scream that should be a bit quieter.
The actual gameplay is fun but I think it should probably have you fail your run after X amount of humans die, it could be like when 20% alive, get shocked or something instead of every single human, because I kinda was unable to lose due to that. After wave 15 I wanted to get upgrades so I tried to lose on purpose, and I was simply incapable of killing the humans quick enough before the next wave. I got to wave 19 and just quit to the menu cause I couldn't lose fast enough, which loses your progress :(
Another suggestion I would have is to maybe scale the difficulty a bit quicker because the first couple waves seemed really easy, but that's more of a personal preference so I can understand if that wouldn't be something you would want to change. Lastly, maybe a little bit of a safety radius around the player from enemy spawning, because sometimes they would just spawn in my exact spot and die immediately, so if the enemies couldn't spawn within a certain radius of the player that could be avoided.
Overall a fun game that has a lot of charm to it!