Game a Week: Amusement Park Builder

This week we are looking at my latest amusement- ahem, I mean game. It is still very much a work in progress, and isn't really a "Game a Week" as I have started it well before the beginning of this week, and intend to keep working on it. But I thought I would show what is eating my time.

I've trying really hard to develop a solo game that uses the shake and make mechanic. So I did my best beginnings. I chose the amusement park theme because of Boardgamizer, and quite like the idea.

First pass rules:

1 player
Hard limit: 12 turns
Make the best amusement park possible in a year!
Shake and make: 3 equal segments 1, 2, 1

To play the game you start by randomly placing a face up chit on each of the nine spaces.
The number corresponds to how many customers you will get if you build there.
You then shake the container, and read your results. Depending on colour of the button (brown, white, green) you collect one or two cards of wood, metal or money
You may spend the resources listed to buy new attractions or build roads as listed:
2 wood, 1 metal = minor attraction (x1 customers)
3 wood, 2 metal = medium attraction (x2 customers)
4 wood, 3 metal = major attraction (x3 customers)
2 metal, 1 wood = road
2 money = 1 of either resource
5 money = 2 customers

You can then use your resources to build as much as you like.
Every amusement must be attached by a road to a previous amusement.
If you build a road past an open spot for an amusement, that spot is now defunct and cannot be built upon.
When you build an amusement you gain the number of customers shown on the chit, times by the size of amusement you built. (chit says 2, built a Major amusement, you get 6 customers (2x3))
Once twelve turns are over count out your resources, any set of five is equal to 2 more customers.
Count your customers, that is your score.

I'm trying very hard to design it in such a way that everything will fit in the box I am using for the shaking, so everything is rather tiny.

I like it as a jumping off point, but there is very little tension, and the number of customers gets bigger than I would like. So I need to mull on it quite a bit more, but I thought I would share where I'm at.

If you have any thoughts, I would love to hear them!