I am liking the ideas put forward here by Herby and others. I did find the "chink" vfx very useful in the past when I have played WinLemm and SLT with the sound off - for example, in the living room whilst the children are watching TV, if there's also a conversation going on in the room, but could also maybe be if SLX was played whilst in a public location such as on public transport, a hospital waiting room, etc.
I didn't think the "chink" text looked too bad. Maybe if text vfx were implemented, there could be an option to either have them turned off (default), turned on on their own, or turned on with symbol vfx, although the last option may not work very well (having both activated) unless the symbol vfx that had equivalent text vfx were disabled if both were activated. That sounds like it would be very fiddly though, so options for either text, or symbol or none, would be the best solution?
That idea for off-screen vfx to the left and right of the screen is fab! Could be very useful for sound-off/hard-of-hearing situations, The only thing that could be an issue is the vfx obscuring what is occurring on the viewable screen area. For instance, if a builder was building a bridge near the edge of the screen whilst another builder was nearing the end of the 12-brick run off the screen on the same side, and there was also other on-screen activity going on that produced vfx, it could all start to get too cluttered/confusing. One way around that might be to have different colour vfx for off-screen and on-screen (as possibly implied by one of the screen mock-ups).
It might be pretty cool too if, for the builder vfx, if three bars would appear when three bricks remain, two bars, when two, one when one, then the exclamation mark when the builder is about to give up and walk on.
Is there really any point in a "Let's Go" vfx? It's already visually indicated when lemmings start to fall out of the entries because you can see lemmings falling out of them
Still, if it's optional and not too difficult to implement alongside other vfx, then why not, I guess.
The timing issue for off-screen effects seemed to work just fine in WinLemm and SuperLemminiToo, although in both cases they are only audio not visual. Does having the visual element as well make the timing process much more difficult, then?