Really fun game, I liked the puzzles, though it was difficult, it was fun to play. I thought that the concept was pretty good, and has a lot of potential. I did how ever think that level eight was a little too difficult.
I wad thinking I was going to make 15 levels and wanted to add a metal indestructible tile but I didn't have the time so I ended up making the last 3 levels way too difficult. If you go to level in the options menu you can choose any level if you're stuck.