Good presentation but needs work. I think its way too simple, it doesn't really grab attention or do anything funky with the mechanics presented. The multiple switch was cool, but ultimately does not matter at all. Electrons spawn endlessly, thus electron collision isn't an issue as well.
The level selector only reacts to keyboard, not mouse clicks, a bit annoying
Turning things the other way with the right mouse would be cool, even if its impossible to do it by keyboard. You sacrifice quicker reactions but gain the ability to spin the other way.
Sound stacks when multiple nodes are present.
Good luck with the project!