No worries, you should be really pleased! For a first game I feel like this shows some really well considered decisions, I've only been doing them for about 5 months, but they are such brilliant learning experiences. Using the time to try new things is invaluable!
Just a note on the response there too; it was more that the suspense was missing when you knew the alien was far away. Knowing he is over there is much more reassuring that hoping he is not nearby!