The summer signing from Sunderland made his first start in Rovers colours, but saw his defensive partner Grant Hanley sent off after just 30 minutes.
Rovers battled hard throughout to hold onto their 8th minute lead but fell to a last-gasp winner at the DW Stadium.
"We showed great spirit together for 60 minutes with ten men," said Kilgallon.
"The concentration showed by the players, the way we kept talking and stuck together was great."
At 29, Kilgallon is the elder statesman of the squad, but he was delighted with how his young team-mates adapted to the situation.
"We are absolutely gutted about the result, but it is a loss that could be good for us in the long run." added the defender.
"We looked so organised for a young team, they are picking the game up great the young lads.
"They are making it easier for the back line by being in good positions, cutting balls out, stopping the crosses.
"Lowey played at centre half for 60 minutes, Jake, as a young lad, was coming out for the ball and helping out, so as a team performance I thought it was good, but we are just gutted."
Kilgallon could make his first home start in Rovers' next Sky Bet
Championship match on Saturday 19th October when Charlton Athletic are the visitors to Ewood Park.
Tickets are on open sale priced from £15 for Adults, £10 for Seniors and £5 for Juniors. Book online today at www.onerovers.co.uk