Which colour you had these games?
Game I just played

I would suggest using the ******* we know as "Computer Analysis." Never a good move, but it provides much stronger analysis than I do. :)

With the first, nothing jumps out immediately, but in the second you missed a few tactics.
First, 22.Bxf4 wins a piece, ...Bxf4 is mate after both Re8# or Qxh7#. Still possible on move 23.
And 30.d7! threatens Re8, so Black must play 30...Bxd7, which loses the bishop after 31.Rd5 followed by 32.Ba4 (30...Rg8 fails to 31.Re8 Bxd7 32.Bg7#).
Thanks corum your analysis helped me a lot. I often miss forced mate especially when I'm running low on time.. thank you too scarblac

in the first game, you should have played 36. Rxa6+, getting you a queen and a pawn for a rook, not just a queen trade.
in the second, your opponent's opening choice was a little odd, but you handled it well, even though 10. Bg5 was a useless move, he was already cramped, and you did not really help that fact. Also, Rxe8 was not a good move, unpinned his knight and gave his queen the open file. Make him take you in that situation. Also, you must protect the pawn on the seventh rank as long as you can!
I have never really had my game analyzed before, but I would like to see how it can help to improve my game.. If anyone can give me tips about my style of play or anything that would be great. Both games have some blunders because of time restraints. I should have won both, but I blundered pretty bad on the second one.