Game Review request - 5k vs 4k

C11 (move 45) felt like the losing move to me, as I chose to invade where my opponent was strong instead of attacking his weaker positions on the right side. My invading stones lived, but at the cost of significant reductions to my territory all around the board. That’s my summary, but I would appreciate a review from someone stronger. Thanks in advance!

Wow, very interesting opening by white, four 7-5 points. Could someone comment on that? I’m not familiar with that kind of play.