That was a limited time offer in the end because I couldn't have the sale run forever, but I may be able to provide a key for the full game after I verify a few things to ensure you own the original and your purchase was within the time limit for the offer, if you weren't able to claim it in that month.
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If you want the game for free and don't care for the Steam key, I can sort you out. Otherwise, I'm afraid itch.io doesn't give access to Steam keys for free purchases (either from a 100% sale or from an itch.io key being given). That was a thing I did not know and I wish I had a better workaround.
And not only that, but I can't make the sale be the cheapest possible (99% off for 20 cents) because minimum purchase price for a sale is 100 cents (and 95% off gives 99 cents).
If you enter a new file, you should be able to select your choices in the visual novel itself until you have selected all options that change TRUST values. From that point on, you will be able to select choices on the flowchart itself (this is to prevent people switching options but never seeing the event that happens after they pick an option). The help button on the flowchart explains how the flowchart works, hopefully it may be of further help!
Both games technically spoil each other, and also technically don't spoil each other. I would say Birth ME Code to Head AS Code is simply a different experience than Head AS Code to Birth ME Code. Different things will be suspicious, different characters may be interesting, and some twists from BMEC will be more relevant if you played HASC while other twists from HASC will be more relevant if you played BMEC.
If your screen is a bigger resolution than 1920x1080, it currently doesn't stretch to fit the screen properly. I might fix it in a future patch since I figured a way to do that, but since it'll require a good amount of recoding for other things, I might not be able to.
I will eventually update the demo with some more stuff in it, and the puzzle will most likely be slightly modified further. From testing with someone who plays a lot of puzzle games, this seemed decent difficulty to start things off.
The comment above hasn't aged very well, but I do still intent on bringing the game to Steam at some point. It will most likely be around the time when I'll be releasing Birth ME Code on Steam too, which is the second entry in the series.
I'll be taking a look into it momentarily then get back to you. Have you played the demo yet? Edit: I checked a few times and the transition should be seamless. If you hadn't played the demo yet, it's part of the full game anyway; it's just the very first parts of the game.
I will attempt to bring it to Steam as early as possible and I'll also be looking into a way to grant those who purchased it before then access to it when it comes out on Steam, but it won't be until at least one more month has elapsed.