I think this is a lovely concept that has some really good roots for further development (if you want to!). I liked the risky nature of selecting bigger garden sets for greater point values - and the variety of flowers are neat. Mostly, I think this game relies on audio/visual; and for 48h its quite cute and pleasant.
I think customisable garden layouts and the abillity to rotate setpieces (especially for those L bushes) would be nice. Also pathing, statues, water features? maybe a requirement of completion is that the gardener can walk from his house to the other side unobstructed.
thanks!