Rainswept system requirements state that you will need at least 4 GB of RAM. You will need at least 1 GB of free disk space to install Rainswept. An Intel Core 2 Duo T5500 CPU is required at a minimum to run Rainswept. The cheapest graphics card you can play it on is an Intel HD 4000.
Rainswept will run on PC system with Windows 7 and upwards. Additionally it has Mac and Linux versions.