This was a blitz game with 3 mins per side time controls.Kind of opening that opponent used,I thought I could have exploited it better.I made a few wasted moves because of which my opponent gained tempo and I could not do anything useful.

Will apreciate some insights.Thanks!

Black went for some sort of hedgehog system, but played it wrong. When I play it, you need to wait for white to commit himself before pushing out. Here black traded a load of pieces with a pawn structure where he shouldn't do that so from 15 onwards he was on the backfoot completely, undeveloped and with too much space behind the queenside pawns. I'm not familiar with 1.e4 systems, only thing of note was moving the bishop twice, but I suppose you weren't expecting black to be so passive.

Most of your moves were fine, just shows how important it is to control the open files with rooks, especially doubled. I might have played 19. e5 creating a strong outpost for the bishop, and frees up the e4 square for your knight or light bishop.

30. f5 is another possibility too. Black lost it on 33, Bc5+ might have been better, and give a platform for the knight to attack on g4, Rd7+, Kh8 etc Could have given them a draw I reckon

Instead of 31. Nf1, what about 31. Rxf7+ Kxf7 32. Rd7+ ?  You can recapture on g3 after taking the Bb7, prohibit access to the d-file and occupy the 7th rank.  Just a thought.