Growth Clicker - my February challenge, inspired by Curiosity

tldr: seeking feedback on Growth Clicker, nothing is off-limit

For 2016, I decided I would do one project each month. In January, I read 5 books in 31 days (almost 5 years after opening my last book). In February, I wanted to tackle another challenge standing in the back of my mind for a while: creating a "multiplayer" game from scratch.

It's highly inspired by Curiosity – What's Inside the Cube?, except you're not fighting against each other to remove the last cube and win a shitty price, you're playing coop to fight the server's endless growth mechanism.

Though it still feels prototype-ish, I find it interesting enough to not completely ditch it and try to maximise the last 7 days I plan to work on it. My main goal right now is set to tweak the progression curve. There are many parameters that I want to play with (server growth speed, upgrade costs, tiles health, ... ).

I would love to hear feedback on pretty much anything (mechanics, graphics, "art" (because there is none ;) ), netcode, ... nothing is off-limit).

Growth Clicker (the server is hosted in Europe, you might experience some latency issues if you're really far away but I hope my netcode is good enough that you can have a decent feeling of the game from far away)