I get what you're saying, it's definitely a little bit more complicated to steer than your regular twin-stick shooter haha
I'm surprised about the menu bug tbh, it's in a for loop that counts up to a number and then queue_free()s so you must have managed to trick the animation player or something, first time I've heard of it too, thanks for letting me know.
Starting a game is laggy because I do a somewhat hefty for loop at the start to pregenerate some coordinates used for advancing the spread of the corruption, it kind of was the only solution to fixing the lag created from generating these step by step during gameplay but I agree that should have happened in a multi-threaded way in a loading screen, I'm just unfortunately too experienced and couldn't make multi-threading work (darn you mutexes), oh well there's always next time.
Thanks for playing!