I like this game better than the V2. If you can increase difficulty after certain milestones, it would be even better. For example after a number of kills, say 70 or 100, add another spawn point so you fight 2 alien ships. And maybe if you achieve a certain accuracy, you also increase their movement speed, but it goes back down if that accuracy is lost again. It reminds me of old school invaders where it was simple gameplay but required skill to get far in. I really hope you decide to update this version.
It is strangely addictive trying to get max streak and higher % accuracy, but rather predictive once you get a hand of it. For something you did during class, very nice! Will give the second one a go now.