Pretty nice, and i see that you're a fellow Godot engine user. If I had to give my feedback on things that could improve, I'd say that you should leave a bar/warning telling how long Stella will stay awake or groggy, or when she will wake up next. Also, I noticed that you can "wake up" her when she's not asleep apparently, was that intended? Just thought you should know.
After all, congratulations for the game, it's interesting and pretty challenging ( I took quite some time go get the hang of it and I still can't survive 2 waves :c)