The Gamma Bros are back and we're busily working on v.1.5.
In the meantime, we're taking pre-orders here: https://www.pixeljam.com/gammabros
You'll receive the already-updated Gamma Bros 1.1 right away, and have an opportunity to catch some limited time rewards in May, before we end it & launch v.1.5 on STEAM as Early Access.
We'd love to add Local Multiplayer mode so all money raised from pre-orders and the reward tiers will be going towards that, and STEAM sales as well. So eventually it will happen. Just a matter of how quickly...
Check it all out here, with a lot more detail on what we're adding to Gamma Bros v.1.5. https://www.pixeljam.com/gammabros/