I have introduced a new canvas size: 480x800. This does mean that anything smaller than a Cr-48 won't be able to play the game very well, but there will be a standard edition by the end of the beta, as well as a mobile edition. The current incarnation will become known as Project Helium HD, and will be the primary focus, since it has the most room to add cool features to. Besides changing its size, I've also added more enemies at once, doubled enemy paths to 20, levels now add another enemy to the screen (ie level 1 has 8 enemies at once, level 2 has 9 enemies at once, etc).
The second update changed the keys to the arrow keys and the space bar. I originally wanted to use these controls, but was unable initially to keep the browser from scrolling around when the keys were pressed, which was what lead to using aswd and j keys. But that's now in the past! From now on the defaults will be the arrow keys and space bar, and I may add custom keys later on.
As always, I welcome feedback of all kinds to help me improve this game. Look forward to another big update next weekend.