Thanks for the feedback Cassowary! Really appreciate seeing that you liked the little details, such as the particles when diving. About the bug, thanks as well for pointing it out! Very soon I'll upload a version where it should be fixed.
I like this game a lot. :) Thanks a lot this experience too, and for sharing it together with the code as well! I'm a newcomer and started learning Godot recently. So far I'm really happy :) If I'm right I think this is the corner-case bug mentioned by cassowary:
Thanks a lot for commenting, really glad you liked it too!
The source code is very messy, but I sincerely hope you can learn a thing or two from it. An additional tip is to always try to make things simple while coding: Godot makes it really easy to do stuff that is complex on other engines, and while this is a great help, sometimes we as developers can end up spending a lot of resources on something that could be made simpler. I'm not a master at this by the way, but I thought this tip might help you :)
Thanks for the video with the bug as well! Could you tell me which version of the game you were using? I could swear I fixed this bug on version 1.0.1 (the version at Github is the jam version, where the bug is still present... once the game is finished, I should release it's source again, with a more organized code as well!).
Hm.. I installed it from itch.io client on Linux. This what I was able to research for the version:
$ ./diver_down-linux64.x86_64 --version
$ md5sum diver_down-linux64.x86_64
On itch.io it is reported as : game 318624, version #1105963