Woah, that is odd. I doubt the game can crash your computer from within the very restrained environment PICO-8 uses, in fact, the game is limited to work with only 2MiB of RAM. Did the error appear on the game itself, a pop-up Windows message, or a BSoD? Could there have been another program in your system that caused the crash? And did you run the game from the browser, or a downloadable version?
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the comment is mildly misleading, when it freezed up, it didnt exactly crash the computer, but directly after the crash i remember checking task manager to check my memory usage, and it was up to 98% (i have 16 GiB of memory), and couldnt use the taskbar to restart to computer it was so unbearably slow, so i had to CTRL + ALT + DEL menu to restart.
the error appeared on the tab itself, the entire tab reloaded and displayed that error on the "aw snap!" screen (I was running it on the browser version) and while writing this reply, some weird things have been going on inside this window and im starting to think that it WAS a different program in my system.
I just opened up task-manager and yea apparently a program called "support assist agent" is taking up all that RAM, its apparently something that only DELL laptops use (the thing im using right now) and from what i can see on the DELL forum some other people are having that problem, so yeah i guess it was just perfectly timed to screw me up from completing the darn game