Enjoyed this tough and tense puzzler. The concept was a refreshing twist too. I ended up completing all three levels, with a strategy of placing unwanted tiles in the corner of the stage until the right one came up. That ended up producing very simple solutions, which didn't feel like the intended playstyle, but there was no time to think creatively. :)
Also, it would be great if the reset button were always available instead of needing to wait to lose.