I played it to the end and it was indeed possible to progress without using the time stop mechanic, only a little more difficult on that last level.
The graphics also reminded me somewhat of the game I made for the last Nokia Game Jam, maybe even to my current one, though yours were cuter.
Taking a similar angle to yours in designing these games, I think I can see that, while the game is fun and cute as it is, given more time and work on the level design part it could become something really good.
In any case, congratulations on your work! :)