If you don't want to upgrade to Win10/11 out of principle or fear of Microsoft's surveillance etc, the other option is to install WMWare or VirtualBox or other emulator on your Win7 machine, and install some flavor of Linux on the virtual machine. Then you can just play the Linux build of this game (or most other Unity-made games, and devs almost always build for Mac and Linux, this costs almost nothing so everyone is doing it). This game is so light on PC usage that I'm pretty sure you won't get any lags on the virtual machine, even if it's a very old laptop you're using.
thanks for the quick answer, that's a bummer. win7 is perfectly fine for what I'm using it for, which is pretty much everything. I see no point in constantly upgrading everything just because there's a newer version. if the current one works fine and the new doesn't do anything I care about, fuck it, especially with new versions always introducing more annoyances, bugs or fluff. I have a potato that still runs most of my unplayed games, though some clients unnecessarily blocking win7 make it harder.
a lot of games, old and new, run on older versions of unity and have no problems. pretty sure your game, which is just basic solitaire, would've been fine too, had you not opted for the latest version, then it would've reached a wider audience (puzzle/casual people not into the latest hardware/software). I also have a potato laptop with win10 but solitaire is not something I'd like to play there. or anything really, hate laptops, but it's a necessity sometimes. linux and virtualbox fuckery sounds like too much work only for this, I'll just wait until I get a new pc, plenty of other solitaires to play until then.