In terms of game file size, you will need at least 500 MB of free disk space available. An Intel Core Duo T2050 CPU is required at a minimum to run Overloop. The cheapest graphics card you can play it on is an Intel 82945G Express. Overloop system requirements state that you will need at least 2 GB of RAM.
Overloop will run on PC system with Windows Vista or later and upwards. Additionally it has Mac and Linux versions.