Wow, we had the same idea! But, I like the different direction you took. A couple points of feedback:
- I felt like I could just sit there a spam C to just repair the turret, go collect the skulls and upgrade it a lot. There wasn't much else to do but wait
- The slime got stuck around a corner a few times which made really easy to kill them
Besides that, really well done! I love the art style and the story at the beginning! Keep up the good work!