Some parts of these levels need some major improvement as players can get stuck or do things the unintended way
1. Most of you will now the following room, but have you ever noticed you can get stuck in the corners
http://steamcommunity.com/sharedfiles/filedetails/?id=175469926
2. Some minor improvement is needed in this room as it's possible to trigger the ghost block from the outside due to a minor gap where the solid blocks meet
http://steamcommunity.com/sharedfiles/filedetails/?id=175470261
#2 happens in any place with diagonal blocks, granted there are only a few of them.