I'm glad you like it :)
As for the "dice won't go above four" thing - you can't break the sides of a dice. A D4 will only ever be able to hit a maximum of 4, a D6 can only ever go as high as 6, and so on.
On the plus side, you can also never go below a 1! :P
v0.20.0 will provide more tools for buffing your rolls and upgrading (temporarily and permanently) your dice, so you can get those sweet, sweet high numbers.