Has a lot of promise. I'd recommend loading everything at once with a pre-loader. This game has a lot of promise, and I could happily waste hours playing a game like this, but a few things need to be addressed.
--The way items are placed could do with being tweaked. IWith each item taking up two squares, it's possible to place an item halfway into a way, as long as it's the bottom square that's encroaching, which seems a little bit weird given that the perspective on some of the machines (Change machine being a prime exmple).
--An option to rotate items would also be beneficial, particularly for people like me who have to have things absolutely perfect in terms of placement and orientation.
--I think the prices, particularly for the wall tools, are a little unbalanced when considering the starting size of the arcade building. You start out with very little space, which makes it difficult to complete the early missions in the tutorial and gain more space to complete the missions to finish the tutorial.
--Issues with the scrolling mechanism. Possible to scroll right and up by hovering at edge of applet, but not down or left.
--Minor bug occurs when attempting to dismantle an object before it's finished building, which makes the game crash on most occasions.
--Tutorial will loop back to the beginning and get stuck at "Let's build a change machine" if the arcade is accidentally closed during gameplay.
Seriously, I've given this four stars because it's a game I'd love to play when it's finished. I could, as I've said, happily lose hours of my life on a game like this, but it needs work. Keep it going!