To me, it isn't always clear where blocks will be pushed. Undo would be great for that even if it is just one step.Other than that I liked it.
Thanks for playing! The game does have an undo button (z), I agree it would be quite frustrating without that.
Ah, I didn't see that. Now it is doable.
Btw. Lvl 12 has a very easy solution.Trip the one-way lever and then go back to retract the green blocks and walk through.
Ah yep, damn, user testing is important!