So, one of the complexities of being mostly a PC game TASer is that TASing PC games is... difficult.
While several games (such as Spelunky or Minecraft) have absurdly good dedicated tools, for most others you have to venture into them with the real possibility of things not going as planned. Don't get me wrong, the advent of tools like libTAS have made so many games possible to TAS now, and it is thanks to that tool that I've gotten stuff like Iconoclasts, Bastion and of course Sayonara Wild Hearts done.
But plenty of games still elude me, and here's an small list of them. Most are due to libTAS issues, and I'll briefly explain what stopped me from getting a full game movie done:
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The Swapper: While it is a Mono game, like Bastion or Celeste, the physics engine behavior seems rather erratic and it was prone to desyncs just by me changing stuff several thousands frames later. I'm giving it a second look.
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Lenna's Inception: libTAS is currently unable to boot Java games particularly well
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Super Smash Flash 2: this one does not depend on libTAS, but on Ruffle, the flast emulator. Currently no version of SSF2 more recent than 0.9 boots, and 0.8 or older boot, but can't get a match started.
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Guacamelee: For unknown reasons, it softlocks on the title screen when booted via libTAS
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Celeste Classic 2: Due to floating point differences between picolove (the tool used by CC TASers to make their own TAS files for the game) and the actual PICO-8 executable, the converted files from the current TAS do not sync when parsed into libTAS.
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Get in the Car, Loser!: Unity 2021 and forward changed how threading works, making the much harder to keep in sync for libTAS. And as anyone who followed my work for SWH knows, Unity is already a mess to keep working to begin with! It would also require a manual port, as the game has not been released for Linux.
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Severed: Not a PC game, but a 3DS one. While Citra has TAS tools, they're still very primitive and wouldn't allow me to produce a quality TAS in a reasonable amount of time.