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Craig Cathcart put the visitors ahead before substitute Simon Church won and scored an 89th-minute penalty.
"There were lots of positives out of it even if we'd have come off and lost 1-0. They had a good mentality and attitude," said Coleman.
Wales face another Euro 2016 warm-up game against Ukraine in Kiev on Monday.
"We look forward to our next challenge now," added Coleman.
"The team will change up again, and we'll see how they go again."
Striker Church, currently on loan at Scottish Premiership side Aberdeen from Reading, was delighted with his equaliser from the spot.
"Northern Ireland were a tough side to play against. They've obviously done well to get where they are and it was a tough game," he said.
"We wanted to do well because it was the last time a Wales crowd would see us before the Euros and we wanted to put in a good performance.
"I've just got to keep going now and hopefully score some goals. This is a great squad to be part of."

The adult female's remains - including a head and hands found in a bag - were discovered in eight locations, Irish police have confirmed.
They are investigating whether the death is linked to a personal dispute.
More than 200 gardaÃ­ (police), Irish soldiers and civil defence personnel are continuing to search the area.
The man arrested remains in police custody in Bray, 20km (12 miles) south of Dublin, where he can be questioned for up to 24 hours.
He presented himself to GardaÃ­ in County Wexford on Tuesday night and was subsequently arrested, Irish broadcaster RTE reported.
The focus of the murder investigation changed following a series of developments on Tuesday evening.
The results of DNA tests from the partial torso discovered by two walkers in the undergrowth, close to Military Road, on Saturday night showed the body was that of a woman.
More human remains, including a head and hands, were discovered over a 30km-area on Tuesday.
Police said they had now recovered most of the remains, and that there is only one victim.
Supt Pat Ward, described the unprecedented case as "troubling".
"We are conscious of the fact that the body found is that of a loved one," he said.
"What we have found are limbs, we've also found some significant parts of the torso and we've also found in one of the locations, in a bag, the head and the hands of the deceased," he added.

Public Health Wales (PHW) said 21 of the 35 residents at the unidentified home had been ill since 10 April.
It is unclear if the flu-like illness caused the death.
Earlier this week, it was revealed that two people had died after a flu outbreak at two Swansea nursing homes.
Public health officials said five residents had been hospitalised and the remainder had been offered the anti-viral drug, Tamiflu.
Carmarthenshire council, which runs the home, said it was working very closely with PHW.
Dr Mac Walapu, consultant in communicable disease control for PHW, said: "In view of the rapid spread and high attack rate of this illness, it is most likely to be influenza.
"We have also recently had outbreaks of influenza in nursing homes in Swansea.
"Flu circulates in the UK between October and April and is not uncommon to see outbreaks in closed communities like nursing homes, where the disease can spread easily."
Dr Walapu said people with flu would usually experience a fever, chills, headache, body aches and fatigue, and fit and healthy people would usually recover without any complications and without needing medication.
"However, in elderly people flu can be more serious and therefore we have treated residents at this home with Tamiflu as a precaution," he added.
Sheila Porter, Carmarthenshire council's head of primary, community and social care, said they were working very closely with PHW to support residents, visitors and staff by providing information, advice and reassurance.
"Sadly, one of our residents has passed away and although the death is not confirmed as linked to the flu-like illness, we extend our deepest sympathies to the family who we will continue to support," she added.
Earlier this week, PHW said two people had died and five others were in hospital after a flu outbreak at two Swansea nursing homes.
A total of 17 people have tested positive for the influenza.
Overall, 36 people, including six members of staff at the homes, have reported flu-like symptoms.
Wales manager Chris Coleman said he was pleased with his team's performance after they came from behind to draw 1-1 with Northern Ireland in Cardiff.
[NEXT_CONCEPT]
A 32-year-old man is being questioned in connection with the murder of a woman whose body was cut up and dispersed in the Wicklow Mountains.
[NEXT_CONCEPT]
Health chiefs are investigating an outbreak of a flu-like illness following the death of a resident at a nursing home in Carmarthenshire.