Thanks! I am glad to know that people are being inspired by it!
> sometimes the changes made in the Player 0 tab don't get saved when I move back to the Actions tab;
Okay, I opened an issue so I won't forget: https://github.com/haroldo-ok/vcs-game-maker/issues/174
> Would it be possible to add a block that allows you to mirror player sprites?
This one would be tricky, as the Atari 2600 hardware can't do that, but it might be possible to create ways to automate the generation of flipped sprites, though they might probably use double the ROM space: https://github.com/haroldo-ok/vcs-game-maker/issues/176
As @NickR-Git suggested, the REFP0, REFP1 hardware registers can flip the respective player horizontally (I must have missed that part of the documentation).
I opened an issue to create the necessary blocks: https://github.com/haroldo-ok/vcs-game-maker/issues/176
> And would it be possible to add some sort of blocks, folders or tabs that allow you to group different sections of the code?
Okay, I opened an issue to look on that: https://github.com/haroldo-ok/vcs-game-maker/issues/175