heya, we didn't have enough time before our game was "due," but it shouldn't be too bad to hack in. (famous last words.) if you really want a training mode, lmk what features you'd like to have!
in the mean time, you can try labbing things the old-school way with a second controller. you can hold block after the first hit to see if your combo/blockstring has gaps, or hold buffer an attack so it comes out as soon as there's a gap. you can hold jump on both characters after connecting/blocking an attack to get a rough estimate on frame advantage (or peek at the game's files on github, but there might be an off-by-one error in the code haha)