Thank you so much for the comment!
If I had an hour to add one more thing before the submission date, it would have been a controls/guide page. I ran out of time though and had to rely on people reading the project description which I feel was a big mistake. I also agree that it could have been fun to allow the player to get more units, but I ran out of time though before I could play with the formula. I was finishing the enemy AI hours before the deadline, so there's so much I would've liked to tweak and play with that I just didn't have time for. (You assumed correctly, there was a lot of programming work to do already lol)
I appreciate the sentiment that you might be interested in playing something like this on mobile. Maybe I'll polish M5 up or release something similar for those types of devices someday. :)