Overall, great demo!

• The art, environment and animations are awesome!
• Voice acting is great.
• I love the cube mechanic! Really clever multi-layer utility of the cube!

My feedback

• Movement is a little "floaty" to me personally. I keep sliding off edges and overshooting my jumps.
• The frame rate is pretty low. I know it's a demo but hopefully this game can run at 60 fps at some point.

Keep it up!