I played through level 11. Pretty cool but nothing too challenging yet.
In the level that introduces the the green paths you can make one of them only created paths for "intended" angles to shoot from and when you did it wrong it would just do nothing. I found this pretty unintuitive because earlier in the level I could do the path wrong but it would still appear, so I thought it was a bug at first.
Also you can glitch into it if you shoot it then stand on the spot where it was then reload. It didn't really let me cheese the level or anything but since you normally can't walk through them I assume it's not supposed to work like that.
Also do some rooms have multiple intended solutions? Because in the last room of level 11 there was a little hole in the wall by the one way door that I assumed was for shooting the golden eye because it was lined up perfectly but then it never ended up needing to use it for anything so I wasn't really sure why that is there for. If it's a "secret exit" that unlocks extra levels or something like that then I think it would be better if stuff like that is very clearly not a part of the main puzzle.