Arrow Keys - Move / Aim
Z - Shoot
X - Jump
C - Change Weapons
Spacebar - Pause / Open Map
You can also use WASD to move and JKL to shoot/jump/change weapons, however on some browsers/keyboards you may run into issues with too many keys being pressed at once, nothing I can do about that.
PLAY WITH A CONTROLLER:
If you have a PC Gamepad, I highly recommend using the Joy2Key Software. You can download it: here: http://bit.ly/NCx4h
Saving - Progress through the stage is saved automatically at every major checkpoint. If you have to leave and come back, your progress will still be there!
Bugs - If you do find a bug, please report it to me via PM. Be as descriptive as you can, I can't fix things if I don't know what went wrong!
Sticky Keys Bug - If the keys feel like they're sticking, character keeps running after you let go, please read the third post in this thread: http://www.newgrounds.com/bbs/topic/1123318
This is a bug with some browsers/systems and there's really nothing I can do to fix it.