Nah, it's definitely NOT just you. I posted my thoughts on a NUMBER of differences between Flash and HTML5 versions here, in my Maraqua support topic.
I used to average roughly 12.5 points per game in the last couple Flash ACs. I could score 17 points in the Flash version, but in this one, this year my best is 12 goals so far, got it twice tonight. Last year my best was 14 goals. Has that 1 time, and 13 goals 9 times in 224 games.
I forgot I was screenshotting ALL my scores last year. This year I went back to what I did during the Flash ACs, only scores of 10+ get screenshots. LOL Whoops! XD
Anyway, for a list of changes vs the Flash version I'm not used to yet, check the thread I'm linking to. Not EVERYTHING is there, I forgot about the invisible snow yooyu from last year, but tbh, now that I remember it, it wasn't THAT big of a deal because there's ALWAYS the shadow. Also, the BEST power up in the HTML5 version, I would say is the Goal Extender. The goalie can EASILY catch a yooyu fired from the Growth power-up. The wing's speed is always useful, but not as useful with the goalie's AI improved. Also, the freezing power-up only seems to work maybe half the times I get it. Just some additional thoughts I've had not in my posted topic.