I've played this game an unhealthy amount. Absolutely love it!
The random cards will every now and then give me two cards of the same composition though, like for instance 2 waves both to be placed somewhere in column 3. I'd love an update that addresses that.
Speaking of the waves, I also think the way they're scored could perhaps be a little more interesting. The only way to get more mileage out of them is from houses, but other than that the scoring on them is somewhat flat.