I actually enjoyed this quite a bit! The puzzles were well designed and I managed to beat all of them. Sadly, levels 3, the physics are a bit weird and hard to work with. Not to mention the ghost sometimes don't repeat your position properly. Keep learning gang. 

Cool idea, and I couldn't figure out level 3 too I thought you had to get the boxes over there xD. But sadly even after knowing the solution I wasn't able to execute it 

I assume you are recording the movements for the ghosts, as opposed to their position? The ghosts were often quite different from what actually happened, causing me to quit on level 3. Saving the positions of the player instead of the movements I think would make this alot better and more consistent. I do think a puzzle game like this would be fun to play if the ghosts were more consistent. I also do feel level 3 was a large jump in difficulty from the previous levels, and couldn't figure out a solution, especially considering pressing R reset all the ghosts, forcing you to jump off the platform to keep them if you wanted to restart. (perhaps a full-reset and a soft-reset would be better?)

I was stuck at level 3. I was supposed to blow the boxes all the other way?

The game is a little bugged, the jump is not the same when you pressed longer the space bar, the ghosts falls when I jumped previously and the platform are slippery. Don't stop learning, game jams are made for this ! Good luck !