I like the style with the unlockable cosmetics that takes this game from just dull clicking to see what the next decoration looks like. The game was a bit short but nothing that troubled me.
The idea with the higher upgrades being more expensive in a cost/profit ratio would be a good idea if it were not for the hold-ctrl-to-buy-max implemention. There is no need to buy any other upgrade than the first one.
This could use some graphical improvement, but I found it neat as it is. I played using a touch-pad.