You receive stars to put in your Jedi powers after each level. I wasn't real clear on what determined how many stars I received, but I do know that if you find every secret on the level, you'll get an extra star. Be careful when putting stars into Force Jump. It's one of the most necessary skills of the game, but with enough stars it's possible to jump so high you nearly kill yourself when you land. The levels take a long long time to load, but fortunately once you load a level, you can load a saved game from that level fairly quickly.
Enemies are pretty clueless.
It's great fun to use Force Pull on stormtroopers and then cut them down with your light saber as they run around crying. Why they don't try to punch you, I don't know. But at least the Kell Dragons in this game can't be killed by slapping them around like in the original Dark Forces. In Jedi Knight, you have to use explosives. Which reminds me, the sequencer charge is nearly useless, except to kill someone chasing right behind you .