I built my beaver with defense/vit, only to discover that defense is more or less useless in this game. Just stack vit/magic as they are by far the most useful to beat the last boss easily, then use the first spell to get close to him. Attack/luck might be ok to get through the levels quickly
The timer should start after you click any button, some of the A+ times were a bit too easy, sticking to a wall needs to happen a little faster and also I think having up as jump and spacebar as jetpack would be a better option. 5/5.
Tip to make money while afk hehe just get ur rocket lying on the ground horizontally and then hold down and left/right and you wont get hurt but it will keep moving slightly. Then right click out of screen/click another tab and voila :) Only really helpful at the start lol