Dungeon Cube - what to change? [Android]

I have released on Android the beta version of my game: Dungeon Cube - what to change?

I have just released on Android the beta version of my game: Dungeon Cube - and I would like to ask you for your opinions and suggestions on what to change / add in it before the premiere). This is my first game, so any suggestions (e.g. how to improve balance, monetization, marketing, what to do to make the game more interesting) are welcome. Thanks in advance!

Download link from the Play Store: https://play.google.com/store/apps/details?id=com.janushex.dungeoncube

What game is this?
A mix of logic and ruguelike game with elements of character development. Walk on the 3x3 or 4x4 board and slay monsters for gold.