Cool concept. The heart text on each building/plant was a little misleading though. They all show +x%, rather than if they have positive or negative impact. Some feedback as to what the next upgrades will do would be very helpful.
I did run in to a bug after upgrading the house past lvl 4 that crashed the game. Also, the play area did not scale correctly, causing me to only be able to see half of the squares on the outside edges.
Good attempt, I would definitely play if you took this farther. :)