The game is in active development
Some time ago, I've decided I don't want this retro thing to take space on the screen. Now the whole screen is playable area.
A lot of things had to be changed for this, but it's finally done!
More content, more QoL 
But firstly, I have to address the problem I see with demo versions nowadays. More often than not, demo versions here on Steam are released for limited time and are removed after sales being open. I don't like this practice. I still remember good old days when demo versions were just small games you can enjoy and they didn't go away just because a publisher wanted to make more sales.
So this is my promise: the demo isn't going anywhere, it will always be available and I will keep updating it too.
In other news, we have new font, some useful options in the pause menu, updated graphics, and now you can save the game to resume it later or on another device.
Challenge rooms now reward you with upgrades. And there are a lot of smaller things that were added or adjusted, all to make the game feel better.
Preparing for release
A lot more non-demo content was added and even more is planned.
I've decided to limit the demo with one playable character and five dungeon floors for now. Full game will have a lot of characters, much deeper dungeon, permanent inventory and crafting systems, achievements, leaderboards and many more features I am not ready to reveal just yet.
Stay tuned!