Short but sweet. After getting used to the unusual thrust mechanism, i was cruising around, exploring each level n planning the fastest route to pick up everything n get to the portal in time. The levels get harder as you go and some are fiendishly tricky to complete, with several possible paths and dead ends to trick you with. The graphics are simple, but suit the style of the game and there is plenty of scenery for the unseen aggressors to destroy, increasing the urgency to complete the level. My only gripe would be the length of the game, 6 levels just isn't enough :) also, it would benefit from a scoring system, so you can compare your game with your best score and with your friends