@ SolarLune: Thanks for your feedback. You are able to zoom the camera in or out with the scrollwheel on your mouse. We didn't map that to the controller buttons though. It might be an idea to map those to the backtriggers of the controller.
It can be difficult indeed to clear all 3 levels and the boss in one go and it might be frustrating when you have to start over! We are "experimenting" (Dion hates that word) with different methods of checkpoints and/or regaining lives/health.
In general: We played with some explosive blocks yesterday! .....wait for it....IT WAS A BLAST!

We also recorded an epic battle between Dion and I, I'll upload it soon.