That was fun, I enjoyed it! I liked especially the last level, and level six.. Six mostly because that's the only level I got a medal for, and felt clever about solving quickly XD I can tell there's ways to use less aliens, but the patience required to do the trial and error to learn... I don't have that kind of patience. But I feel like in a full game, it could be worth the grind, if given good incentives! And maybe a faster way to reset/speed up the time or some such. But for a gamejam game, that was fun enough! :3
The graphics are simple, cute and effective. The premise is funny, and the little heart + audio effect when you reach the "goal" is frankly adorable.