(sorry for the EVEN LATER reply)
did you make sure to replace the [dot] with "." and the [at] with "@"? i'm pretty sure that email is up and running. if it still doesn't work you can contact me on discord @d0g5
firstly: game owns (ignore the dickhead asking for it to be free; this shit real good and you could ask for more money imo).
secondly: what engine is this? the character controller feels so solid and expressive and i love how many movement options you get just by adding a kick, it's really inspiring stuff.
oh i'm glad you enjoyed it. i don't actually have much else that's like it (at least not publicly available) but you should check out BARCHboi's Deidia (https://barch.itch.io/deiosiideidia) cos that's what initial inspired a lot of my design choices.
wow yeah that does sound like complete OS incompatibility, which is crazy cos this game was made on a not-that-old mac. it might be worth trying to use wine or something similar; i've generally had more success with 2D games being emulated in wine, but since unity's 2D is actually just flat 3D it might not make any difference.
good luck!
i'm not sure that i have the project files anymore, but regardless, i don't think i can get official support for new versions of macOS. apple is cracking down real hard on independent app development (apps that don't pay for authentication) which basically locks that market away for anyone like me.
have you tried the command line workaround for unauthenticated app permissions?
oh i just realised what you meant by this question; the windows version was zipped with a save file inside it already because i am an idiot. this will almost definitely cause some save problems due to various permissions about where unity games are allowed to write data. i deleted the save file and re-uploaded the windows build which should solve any future problems. sorry for being a dolt.
ok yeah so the save file should just be in the game data folder somewhere. if getting to the "thanks for playing" screen doesn't reset you then deleting that file will. if the save file isn't in the local game data directory then it'll be stashed away somewhere deep in your computer, wherever unity games store their persistent data.
change gears by holding space (or any face button, if ur on a controller) and pressing any cardinal direction, then releasing space while still holding that direction (u can also tap space and no direction to return to the "neutral" gear). each gear changes what the action buttons (R/L bumper on a controller, and J/K (among others) on keyboard) do. the west/left gear is your friend. try pressing the left action button (left bumper or J) twice.
this system has been altered (but not removed) in the current (non-public) build, and i may replace the demo with an updated version at some point soon, but i hope this helps for now.
Oh no! I'm sorry I don't have a Linux computer to test on. If the problem you are having is that the game does not progress past the opening menu (appears to freeze when you select the play button) then this is a known issue on [some] macs as well and I am VERY confused about it. I am going to try moving to the latest version of unity at some point and will release updated builds when I do.