Test Tube Titans which released back in March has you create and mutate massive unwieldy creatures, and now there's a sort-of demo you can try.
One of the big parts of Test Tube Titans is the control system. It's clumsy, with per-limb control so everythings that little bit harder than it would be normally. Control each foot as you attempt to walk around and destroy everything. I personally found it to be a huge amount of fun though!
With the release of the standalone Test Tube Titans: Taster Trial, you can have a go at creating any kind of Titan you wish in the Creative mode and then sending it out in the included level to cause chaos. It also has co-op support for this, plus a PvP wrestling mode to have fun with someone in local multiplayer. It acts as a really good taster.
Honestly I think it's an absolute riot when played with someone else together. Both the co-op and PvP are a huge amount of fun. The majority of my time in the full game has been in solo where it's also very fun as you work through the campaign.