Halloween has no satanic overtones. This is propaganda from Christians and others that hate and are prejudiced against anything that isn't Christian oriented.
Haloween was originally a pagan celebration, All Hallow's Eve, also Hallowe'en is the original old english. Unless you happen to be a pagan, it's no longer any kind of religious celebration, It has evolved to just be a fun holiday, and unless there's some prohibition in the Torah that I don't know of against Halloween, there's no reason you shouldn't enjoy the party.
And no, pagans are NOT satanists. If the people who believe this knew anything at all about the religion they would know that pagans do not believe in satan in any way. Satan is a Christian invention.