I encountered a fatal error with a Blueprint Sandboxes mod sandbox. When a big bertha is placed and you attempt to reset the sandbox, the following error occurred (yes this error was on my "fork" of your mod):

The mod Bigger Artillery (Balanced) (0.2.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event bigger-artillery-balanced::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__bigger-artillery-balanced/control.lua:67: in function <bigger-artillery-balanced/control.lua:63>

Hey :),

should be fixed in the next version.