A bug isn't necessarily gamebreaking. This is a test game, and so bugs are to be expected, and positive feedback to the developer can be very helpful. Making the dev aware of a visual bug can be very helpful, as I can attest as someone who has worked on one or two games before. There isn't any need to get mad at people for pointing out something to the developer if they aren't being rude about it.
I understand, and I'm not against people pointing out things like that. It's just that most of the feedback seems pretty negative to me, and several comments seemed to imply, "my experience with this game was ruined by these inconsistencies." Anyway, for a game which I believe was created as an attempt to practice and improve the game creation process, such criticism should be made more along the lines of "here's something to watch out for next time," rather than describing things as "bugs," which is associated with an expectation of bug fixes. So perhaps I'm just misinterpreting, or I don't really understand how that word is used, but it really, well... bugged me.
Edit: I found the thing people described as a bug. I didn't get it at all the first time, and the magnet thing being the way it was led me to believe that the sundial thing was the same. It's not, and that could reasonably be described as a bug, so I'm editing replies.