Congrats on submitting your game! The first challenge to collect 100 rings in 20 seconds was really fun. I had to start over a few times before I finally got it. Like others who commented, I hit a wall after that. It sounds like you had plans for what the player would do after collecting the first key. At the base of the large tank-looking thing there are cylinders that kind of look like terminals around it. Perhaps the player could deliver a key to each of these to progress.
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Thanks for playing and your kind feedback! Yeah I had to cut what happened after completing the rings due to time constraints but I'm working on a post-jam version that should hopefully be more satisfying. I like your idea of using the cylinders, had planned something else but may be using that one in the final version.