Hey NeonGoo,
thanks for your feedback. As you said it's more of a work around but we recognized that it's really important! We currently work on some first "tutorial" (so to say) instructions. Nothing too fancy - simply to get people to play the game without losing their money too fast.
And that is exactly what happened to you: You weren't able to place the rooms anymore because you had not enough money - at least we assume that because it happens to almost all play testers we were able to encourage to play locally.
The hovering was introduced for juiciness purposes but we are currently thinking about snapping it to the mouse position instead of slightly above the mouse position.
We try our best to make this game fun. And we really like to get your feedback. :D