Thanks! Yeah, I didn't explain it very well, but basically you can 'shoot' your puck in a direction or assume a defensive stance (aka, your mass is temporarily infinite so the other player's puck will just bounce off). Trick is, you can't shoot again until you've stopped, and recovering from a defensive stance takes some time as well, so there's a risk/reward for your actions. To score, you have to knock either your or your opponent's puck into your opponent's goal! Of course, these mechanics are subject to change via playtesting, but that's the idea anyway.