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One problem with the Explosive Runes spell is that it violates the games own rules for magical traps. It has no expensive material component, yet it creates a magical trap that would normally cost 1,400 gp for the spell alone.
A simple fix would be to limit the spell's duration to one day. So that if you wanted a permanent trap, you'd have to use the regular trap rules.
This would at least limit stockpiles of Explosive Runes to the caster's available spell slots or impose a gold piece cost if they wanted a lasting supply.
This issue was brought to my attention when it was illustrated how a cache of prepared Explosive Runes could one-shot anything, including Cthulhu!