Currently, the web version is still experimental, and not designed for mobile.
One of the issues with running on mobile is that the audio effects used on modifications (like the echo) can cause weird audio artifacts depending on the device.
I might add a setting in the next updates to disable the audio effects for a quick fix - though mobile is still not officially supported, so there might be other problems in the future.
Hey there! I've really been enjoying the game, but seem to have the same (or a similar?) issue. I'm also playing in web, but on my laptop in Firefox (windows OS). When any of the modification scenes is playing, the audio stutters (that's the best way I can describe it). Some of the voice lines also stop playing before being finished (due to the stuttering, would be my guess?).
Strangely, the audio (including lines) seems to run fine when I switch active windows, or scroll down the page such that the visuals are no longer on screen. I have no clue why that would be the case though. Hope this can somehow help iron out whatever is going on there? Anyway, looking forward to seeing more of your work on the game!