"Just for improved animations" doesn't seem fair in my opinion lol. We've sunk a LOT of time into this update. Unfortunately, most of the work was under the hood updating the player, damage, health, enemy AI, etc. I said in an earlier post, 75 commits in the last 2 months comes out to over 2 per day. Its a serious investment of our time and effort.
So, you're getting access to an improved and slightly better animated DEMO of the game. The plan is to continue with the next 2 acts, which Patreon access gives you and we'll also be releasing the full game on Steam once its done (I believe, again, I just make things work, not run the show).
Hope that clears it up!