Just wanted to note here, but I found some small bugs that have existed for a while (about 2 years) that I didn't notice. These may have caused some of the issues such as a ton of enemies, bullets, arrows, etc appearing on screen and not going away. They also could have caused your computer to run a little slower.
The bug was a "memory leak" in which certain textures uploaded to your video card were not getting cleared from GPU memory. This would only be a real problem if you have a lower end machine/video card and if you've had the game open for a good while without closing it. This also may have been more of an issue for mobile devices as well since they have less memory, etc. So I just wanted to note here that it was fixed. Other than that, most of you may not notice any difference. =P