In short, I have no idea what I'm doing wrong. The fix is likely simple. Here's my project, poke around.

Question

https://drive.google.com/drive/folders/0B0n3DHQWyHvTUjNXSXhNRG5oODQ?usp=sharing

I'm getting a null instance and I'm not sure why, it's probably an order of operations problem that I just can't seem to wrap my head around. One of you with a better understanding of when things actually take place when a Godot game launches will probably know immediately what I'm doing wrong.

Answer 1

when I run game, nothing happens but mana is increased continuously when click a circle image.
is it expected?
when click a circle, there is an error, and can be fixed by changing 2 lines of code.

var mana_total = 0 # instead of [var mana_total]

func _process(delta):
    print("Mana total: ", mana_total) # instead of [print("Mana total: " + mana_total)]

and you'd better change SAVE_PATH to "user://" instead of "res://"

Comments

That helped a lot. In short, I'm trying to get it to save the mana_total. Upon closing and reopening the program, it fails to read the .dat file, which was apparently not written properly. Do you have any ideas regarding what I'm doing wrong there?

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can't open .dat file?
or problem to read / parse?

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Yes, it tells me there's a UTF-8 error, or unicode error: invalid skip.

Try closing and opening the project again, it fails to load the mana_total value from the .dat file. Do you have any idea why this is the case? Thanks again, you've been a huge help.

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it's because you saved mana value by file.store_float(content)
but read it by file.get_as_text()
need to match same format.
try file.get_float() instead of file.get_as_text()

usually, file.get_as_text() is used with file.store_string()

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That led to a fix. Thank you!