Hey I played your game! Here's what I think: The idea of placing objects to get through the level is very interesting; it would be a lot better if you could see the whole level and place everything beforehand. The level with the "worst enemy" especially made that aspect frustrating because the player moves too fast to place them in time. Moving the player to a previous level doesn't really make for a good or fun mechanic anyways. The graphics in this game were nice. The rabbit and other objects looked nice. I think you should've used some water or a solid block for the bottom instead of the candy-cane (?) things.
Overall, this game is a good start and could probably be expanded into something great given a bit more work and time! Great job!