The U's are now three games unbeaten in League One, but remain seven points from safety with six matches to play.
"The club as a whole is going in the right direction," Keen told BBC Essex. "The players are playing with heart and soul and they're having a right go.
"I thought it was a good competitive game with both teams going at it."
The result means the U's have only conceded once in their last three games, a drastic improvement for a team with the worst defensive record in England's top four divisions.
"I thought we were fantastic defensively," continued Keen. "I'm really pleased with the clean sheet. The boys are disappointed because they know we've got to win matches, but to get a clean sheet against that team, I'm pleased for them.
"They're up in the play-offs for a reason. Realistically, a point is probably a fair result."

Dariusz Parczewski and his wife Bozena Parczewska are accused of forcing a Polish man to work at the retailer's headquarters in Derbyshire then keeping his wages.
The sportswear firm has not been accused of any wrongdoing.
The couple, from Aspley in Nottingham, were released on bail following the hearing at Nottingham Crown Court.
They were arrested as part of a Nottinghamshire Police investigation into human trafficking and were both charged with knowingly causing another to perform forced labour.
Mrs Parczewska and the couple's son, Kristian Parczewski, are also charged with a range of tax and benefit fraud offences.
The defendants are all due to appear at the same court for a plea and case management hearing on 8 January.

Scottish Borders Council and Stirling-based Ramoyle Developments have concluded missives for the former Burgh Yard.
It will be used for a "mixed use" commercial scheme including some flats and possibly a pub/restaurant.
It used to house a petrol station, garages and workshops.
Council leader David Parker said: "There has been a great deal of interest surrounding the former Burgh Yard site, and I am delighted that the sale has now been agreed.
"If it goes ahead as planned, this development should bring a significant benefit to Galashiels at an exciting time, with the Borders Railway opening in less than one month.
"I look forward to seeing it enhance the facilities in the town for visitors and the local community."
Councillor Stuart Bell said the move could bring the site near the recently-opened transport interchange back into use.
"If the scheme comes to fruition, it will bring investment in our region, create new jobs and provide improved facilities for tourists, tying into the key aims of the Borders Railway Blueprint programme," he said.
Jim Turnbull, of Ramoyle Developments, added: "We are very pleased to be able to add this prestigious project to our currently expanding development programme.
"Several operators have approached us with regards to the various commercial uses we have in mind for Galashiels and we expect to be able to reveal our preferred line-up soon."
Colchester United are "going in the right direction" following their 0-0 draw against sixth-placed Millwall, according to manager Kevin Keen.
[NEXT_CONCEPT]
A couple who supplied workers to Sports Direct have appeared in court accused of modern slavery.
[NEXT_CONCEPT]
A chain is in talks over plans for a new 50-bed hotel in Galashiels after the sale of a prominent site in the town has been agreed.