Ignoring the fact that bats aren't actually blind this was very fun and cute. We actually considered using a bat for our game but ended up changing it. I do think the head bob can be turned down a bit as it did get a little uncomfortable in the cave area. I did enjoy the echolocation and while you can spam it I found it wasn't needed to do so but could probably use a cooldown.
Little tip for adding debug stuff, in Godot you can check for debug builds in gdscript using "if OS.is_debug_build():" then just putting whatever code you want underneath, helps if you want things to be used by devs but not accessible by the end user.
Really enjoyed this game I liked it a lot. Great job!