Thanks for the feedback!
I do have quite a lot of ideas to make each plane feel unique and introduce new mechanics, but not sure where I'll get around to all of that. Processing is an example of a new mechanic the game introduces as you progress, but I do get its pretty unpolished and tedious right now, I'll definitely keep working on adding more optional variety and also polishing the existing stuff.
Also, took a bit of work cause Godot stores saves in web exports kinda differently, but I just uploaded a new version that should let you move your save from web to desktop version.
1. open web version -> open pause menu -> click "Settings" -> click "Export ZIP" under the save you want to move over
2. open desktop version -> open pause menu -> click "Settings" -> click "Open Save Folder"
3. extract the zip contents into the folder that just opened
4. re-open pause menu to update the save list
5. click "Load" on the save you just added