I liked it. Waiting is frustrating at times, but I think optional speed settings would help that quite a bit, particularly if speed was adjustable on the fly.
It seems to take a while for all the levels to register as completed. I had lunch, and when I came back it had updated the 28 I had completed at that point. When I finished, it showed 31 and granted the achievement immediately.
Nice effort for a first game.
You need to reset the speed when starting a new game. If you play a couple games in a row, your speed always starts where you left off in the previous game.
I have the same problem as sberanek. Using FF 3.07 and Flash Player 9. Game keeps flashing between instructions and a next button that cannot be clicked. Also tried in an IE tab with the same results.
 "Find the Difference 18")
 "Liquid Measure"){kind=icon}
 "Shaper")
 "Bloony Wheel")
 "Headspin Storybook")
 "faze")
 "SHIFT 2")
 "Time's Up 2")
 "Bricks n Match")
 "Collider")
 "Civiballs")
 "Tetris")
 "Geometry test")
 "Open Doors 2")
 "Assembler 3")
 "The Mathematician")
 "Beogard's Simple Memory Game")
 "Classic Tetris")