Ah, OK!

- It would be cool if you could add regular operations like Undo (CTRL+Z), Duplicate (CTRL+D), Copy and Paste (CTRL+C, +V). It would be good, if you could highlight the arrows as well, wenn hovering with the mouse.
- When moving an object, the object moves faster than the mouse cursor.
- When rotating an object, the axes aren't rotating as well. It would be cool, if you could choose between object axis rotation and world axis rotation.
- The same for scaling; plus, you can't do uniform scaling.
- It would be cool, if you could do screenspace-moving, rotation and scaling.
- It would be nice, if you could add rasterplanes and a snapping option (the object snaps to the grid when you move).