You had some very nice sprites, especially the alien squishing animation in the matter extractor was wonderful and smooth. Having to guide the aliens in was also a nice change of gameplay. The game really would benefit from conveyor belts or any other method of transportion if you cared to add it (the map is relatively small so it's not a must, only if you wish to further expand it later).  One problem I noticed is that meteorites can fall in front of your rocket modules entrance. They dont completely block it but it makes it harder to reach it. I also had trouble in buying a second matter extractor or guiding a second alien into the one I got. You mentioned bugs already but wanted to report on it nonetheless in case you wish to fix it later.

Very cute! In spirit, if not in gameplay, it reminds me of the Apogee stuff from the 90s I used to get on shareware floppy disks (I realize that most of the words in that sentence probably don't make sense to people who grew up later lol) like Commander Keen etc. It really hit all the nostalgic vibes for me, and it's a cool game on its own!

love drilling