Not. Easy. At. All.
The best way to understand the game is to watch the demos several time, while trying to predict what will happen next. After 3 games I have menaged to get a scord of 178 and noticed the following game rules. There might be more though.
In single player you have to survive as long as possible going up as far as you can. How to do this:
At the left there is a cross, where Symbols fly from one of the four ends to the opposite ends.
At this point I have seen four different kind of Symbol: Black/White/Red/White2
You control where the Symbols fly by pressing the up/down/left/right key
The basic idea is to collect Symbols of the same kind at one end of the cross.
Several things can happen, depend on what Symbols are already sitting at an end when a new one arrives.
1. Same kind of Symbol: The Symbols stack.
2. Different kind of Symbol: Old Symbols fly away, new one stays.
3. If you get a Stack of 5 Symbols, they will disappear, and the side will get charged.
4. This will be indicated by a triagle visible close to the side.
5. If you get another 5 of the same kind, the side will get charged more.
6. This is indicated by the triangle filling up, or changing into another geometrical form.
Now if a different Symbol reaches a charged side, the charge gets destroyed (triangle disappears). Several things can happen:
1. If there is only one charged side, the charge is lost. Don't let that happen.
2. If there are two charged sides, the charge will be transfered to the other charged side. That side will fill up/change form
3. If there are three charged side, the charge will be transfered to both other side, basicly doubling itself. A sound "double" is played.
From time to time, a special Symbol will appear with an alarming sound. Two things can happen.
1. The special Symbol reaches an uncharged side: If there is a stack, it gets destroyed, else nothing happens
2. The special Symbol reaches a charged side: The charge is activated and used to make the object on the right hand side fly. This is where you get scores. The greater the charge that get's activated was, the higher that things flies. In the demo1 one can see the cpu activating a full charge (Geometry Form = Circle), lifting the object 450m into the air.
For comparison: If you activate activate a basic triangle you only get like 10m, so it is better to first transfer your charges into one spot or even better double them...
If you want to activate a charge and don't want to wait for the special symbol, you can also press a. This will make a special symbol appear. You can only do this once, but can win more of those in the special mode:
Special mode: If you are able to charage all 4 ends at least with a minimal charge, a special mode starts: In this mode you have to keep all your 4 charges alive as long as possible.
The two player mode is played the same. Here you have to score faster than your opponent.