Art is great, but if I'm being honest the gameplay feels shallow overall and more frustrating then fun. I suspect it's because you ultimately made 4 different games for the jam as opposed to focusing on one, and it feels harsh to criticize the gameplay because of that since I know that's the whole point of what you were going for haha. I do think that if you clean up the specific games to have more depth it'll improve the strength overall, for example, the first game doesn't have any real strategy to it, I would just mindlessly go back and forth shooting as much as I can. The nice thing is that if you're planning to take this further, you have a nice framework to easily add more mini games down the line if you want.