The 35 MB refer to the hard disk space
and in fact hardly play a role
(although the 35 MB represents the download size;
the installed occupancy is higher).
But one thing to consider with every app is the RAM.
It's also pretty reasonable to assume
that not everyone owns a mobile device
that is high-end or has more than 2 GB of memory
The more apps / programs, the slower the phone; an old but still valid IT wisdom.
This is one of the reasons why I only played supremacy in the browser on my mobile phone.