Hi there, after the initial shock of having to install 220MB of mono-complete on my little HTPC I've had a look at what is actually needed from the complete install. After a bit of tweaking I got it down to 32MB, which is much better for users with low space and doesn't clutter up your install as much.
sudo apt-get install mono-runtime libmono-system-data4.0-cil libmono-system-web4.0-cil
Was enough to make it work for me.
THANKS for this information.
I'll add it to the documentation. If I have a lot of time, I'll try to test this + see why we need those.