I'm glad that you enjoyed the narration, I didn't expect that so many people would like it :). The Brightness thing was an issue for me. the physical land was really dark and I didn't want to make artificial light on the aliens so I made markers instead. I think that it worked okay, but yes I would really have liked them to have been brighter as well. The sound feed back thing I didn't even think of until I was already uploading everything and there wasn't much time left in the jam so I had to abandon it.
and yes the random amount of aliens that you need to collect was intentional. But the timer isn't actually random. I simply take the amount of things that you need to collect and multiply it by 3 and add 20. I think that it works quite well. The only time this isn't true is the first time that you play the game when you get an extra 30 secs on top of the regular amount.