Quick guide to dev terms: Alpha: generally unreleased source code and/or executionables which are generally unstable and usually have a good amount of bugs in.
Beta: pre-release "demo" version usually used for allowing the greater community to find bugs that can be easily overlooked by devs
Release: generally bug free and stable.
v43 as your seeing it at the moment is not a beta but an unreleased alpha. when a beta is made available youll find it on the downloads page. otherwise its pretty damn good aint it :D Antimatter rules ^^ (thanks for the idea Catelite!!)
Great alpha! fuse is a bit slow to start, could their be a second fuse lighable by fire (thinking mission impossibe style ) PLEASE take your time releasing the beta to put in more elements!