Those are good suggestions! We didn't want to overcomplicate the environment so that you could discern enemies from the environment (the nokia design space made this a challenge ;) ). The powerups probably would've spiced up the game a bit more, good to know for next time! I spent a while trying to fix the rendering and physics of entities warping from one side of the map to the other, but just didn't have the time to pull it off unfortunately.
Thanks for playing, and glad you enjoyed!