function TLemmingGame.CheckIfZombiesRemain: Boolean;
var
i: Integer;
ReleaseOffset: Integer;
begin
Result := True;
for i := 0 to LemmingList.Count-1 do
if LemmingList[i].LemIsZombie and not LemmingList[i].LemRemoved then
Exit;
=============== FROM HERE =================
ReleaseOffset := 0;
if (LemmingsToRelease - ReleaseOffset > 0) then
begin
i := Level.Info.SpawnOrder[Level.Info.LemmingsCount - Level.PreplacedLemmings.Count - LemmingsToRelease + ReleaseOffset];
if i >= 0 then
if Gadgets[i].IsPreassignedZombie then
Exit;
end;
============== TO HERE ==============
Result := False;
end;

For me, they're more of a nice change of pace after spending countless hours in a certain turn-based RPG, which by design has a much slower pace, and only allows for much slower progress. Neon White, in contrast, even has a mode where you have to beat all the levels in the entire main story in one piece - because most of them only take a couple of seconds, and 1-2 minutes at max.
Hope you enjoy working your way through them.
Seems completely solid here for NepsterLix. Great level! 