I had a problem with the first level with an enemy. I couldn't make it to work on the Web version. The platform started moving from the start of the level, making it impossible to avoid the enemy. On the standalone version, it worked without problems, however.
Another small detail that I didn't see mentioned in the comments, the beeping sound in the menus was only on my right ear, which is quite annoying. The music sounded fine on both.
Other than that, nice game!