Pretty irritating that if you hit "escape" to see the map, it resets the room you are currently in. For example, in E6, if you make a tool to get the 2nd cog but don't go into the room to the left, hit escape to see the map, you lose your progress in that room and have to go back up, remake the tool, etc.
Does it seem to anyone else that sometimes a shape doesn't take a hit when it is clearly in the hit range of an explosion? Sometimes a circle will explode and not take points off another circle, for example.