had no game breaking bugs (beyond throwing the magnet against a door then getting trapped, but easily fixed by restarting).
the last 2 levels kept me stuck for quite some time, so maybe have a few more levels that are moderatly hard to introduce them better, rather then it going from speeding through to being stuck for quite some time.
the only bug that i found that stuck out to me is that in the last room ( after completing all the levels) if i held down the restart level button (for me LB) then the symbol would grow larger and larger, get small again then larger larger and repeat. keep up the great work!