I have to agree with SecretPocketCat about level 3, and I was a bit bummed that my progress didn't get saved. I don't think I want to do level 3 again. edit: oops, I think I'm actually talking about level 2. The lava one.
I think this would have been great on a gamepad.
I appreciated the graphics settings and it's cool that you managed to get a custom level system working.
p.s. Thanks for bevy_nine_slice_ui!