How complete is this game currently
Only a single character is available. It's extremely bad as a GAME in its current state. Enemies can grab you instantly so you never want any forward momentum from the roll or jumping abilities leaving you just the normal kick and slow low kick. You seem to have 0 i-frames and not only are recovery times from grabs bad but just crouching to hit the lower to the ground enemies takes way too long. It's inconsistent which enemies you can damage while stunned as well. Later there are trap door enemies on the ground, and because of the previous issues you can never maintain any momentum for a good jump arc. Also they blend into the fucking floors and ceilings. The dogs are the absolute worst, when you hit them they leap 20 feet back and take forever to recover, but not enough time for you to approach them crouch down again and attack. No you need to stay complete still crouched down and wait out for them to run within range again. Also you frequently get trapped into a loop with them because your recovery animation and crouch animation are so fucking slow! The actual animations are nice and they have a good variety but the design of the game actively discourages you from ever trying them during gameplay.
HOLY SHIT! There's no saving your progress. I wanted to restart the last level because of that grab loop I mentioned, and I exited to the menu assuming my progress with the character was saved. NOPE. I finished on casual. I wonder if attack speed is framerate based. That could explain why recovery windows seem so narrow for me, but all the animations are still slow.
In summary, just use someone else's save for the gallery. You're missing nothing. The artist has a great style and good output as well. Just wish they had someone with sense for game design to work with them. If you look back he's been trying to make a game with these characters for a decade at least.