Since this engine interests me, im planning on downloading it and trying it out. but there are two different releases...
theres this Stable one and the 'Alpha' one.
is there a difference between those versions?
Though each "next" version is a fully-working IDE, each new one brings a bunch of breaking changes, and they all are incompatible with v 0.x. The next-2 has breaking changes in ct.fittoscreen module and camera variables. The next-3, or, maybe, the future release version will probably have breaking changes on how you manage graphics assets, though I will try to make these changes minimal for an end user.
Regarding its release cycle, I post updates as new major features come, similar to how Epic Games pushes its preview versions of Unreal Engine.