Honestly, I'd add futures, but the hotkeys, getting around the interface, it was kind of really easy to pick up. Its extremely user friendly. I was just playing in your browser version for all of 15 minutes. I made an Arcade.
Not sure if it's good or not. I Am used to more vertices. I think it looks like an arcade though.
The only issue I have is the same issue I have with most of the voxel editors, Is complicated UV control. I'll Bookmark it though and post here some stuff I make, And I'll play with it more. Really quick, very streamlined. For an artist like me to just jump in and play, 10 points to you Jannis. keep up the great work, I look forward to the additions you add.