It is quite good compitative score. Ireland does quite good fielding so they should be able to defend this score
220 runs is fighting score if Ireland would succeed to get early breakthrough than it can turn this into its favor, Zimbabwe has nice batting line up than compare to Ireland but some extra bowling spell with wonderful fielding Ireland can get it into trouble.
Yes, agreed with you that Zimbabwe has very good batting line up and they can chase this score easily. They have shown their batting strength in the previous series against Pakistan where they gave tough competition to the opponents. Also don't forget that they have beaten Pakistan in previous series so there confidence and morale is high as compared to Ireland team.