Im working on an RTS-ish game and ive run into a few problems.

1. Rendering/displaying bug: when an explosion happens, the screen skips for a moment

2. projectile moving issues: the bullets dont move quite right, they are launched in some kind of arc

3. Code-wise: Im new to javascript, so the code is not efficient, it could be done quicker and better

Theres more, but I cant think of anything at the mojment.

Does anyone have any advice regarding these problems?

If attachement fails, heres the download:

https://dl.dropboxusercontent.com/u/75625262/supcom.rar