Pretty cool. I like the way the matches run away as you approach them. The only grievance I have is time powerups showed up a lot less as it got closer to the end. Even then, it only added 2 seconds or so.
Thanks for the feedback! Power-ups have a 3% chance to spawn every time a match is defeated, so theoretically power-ups should spawn more often later since more matches spawn as the game goes by. At the end of the day though, it depends on how lucky you are. I also tried to make sure they're not too over-powered, so I though a 3-second increase to the timer was balanced, but if it proves to be under-powered, I'll change it. If they spawn too often or are too powerful, then the game would go on forever.