A visually appealing game, with audio and attention that clearly is indicative of a significant effort put towards it. I think with some work, this could be quite a strong submission.
The beginning transition caused a lot of issues for me, a lot of the times I would play I would just instantly hit an obstacle and the only way to stop this was to wildly flail my mouse in hopes of not hitting something in the first second. Secondly, why do you need to hold the mouse button down, cause that would technically count as two inputs. This feels like it could have just been the mouse control. Next, the intro soundtrack was a bit harsh on the ears at times so please bear that in mind. Finally, consider how people access your game, is the way you have done it the most efficient method?
Overall, it is a good game with some bugs that you have noted. Some polish and bugfixing would go a long way to improving the overall experience with this one. A solid submission.