The Sparkler Laser Layer is completely nullified by a single zombie going goreblaster. Even Increasing the mine’s HP from 1 to 10 would make it so that, if the z-team is really THAT worried about some tickling tick damage, it would take a concentrated effort of several people going goreblaster to completely nullify the mines once more. This can give them a choice of sacrificing five vanilla zombies-worth of cade dps to deal with a minor annoyance or just have one zombie dedicated to swiping at each mine as they’re being laid down.
Either way, as it stands the sparkler is a straight downgrade considering you’re given a choice of either a few 7s of laser damage before being detonated by a goreblaster, or an instant 100+ damage headshot that can’t be countered as long as you lay mines one at a time during lulls in action - the Sparkler does not have this luxury. You could argue that it’s a layer you should use on places where goreblasters can’t get to - an anti-fastie-at-the-window mine, if you will - but in that case why not just use normal mines? They detonate instantly on contact; the fastie has no chance of quickly swiping them all away before they have a chance to do their full damage potential.
Please consider giving those mines some sturdiness. They can (begrudgingly) still go down in one swipe but at the very least they should be able to handle a few splotches of goreblaster blood.