Gave me a little bit of a headache to read through the instructions and figure out why certain things weren't working they way I wanted at first, but I eventually got through it and started to have fun. If the manual had an example or two of how to process some if-then tests (or was more clear, maybe I missed it), it would've sped up the curve for me. Neat concept!
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That's quite a good idea - perhaps add a handwritten page of some helpful tricks and example snippets to the back of the docs. I spent a while wondering how much of the puzzle should be in the game and how much of a meta-puzzle there should be in the documentation, i.e. how you need to use JPPD ION to perform an unconditional jump, or how you can use USER UGU to implement switch statements based on the ION value.
Thanks for trying it, I'm glad it wasn't just pure pain!