Thanks for playing! Truth be told, the reason it turns out looking like this have a lot to do with how all four of us are programmers 馃槀. So we have to find a way to make the game looks presentable without having to do a lot of (if any) assets. We are happy with how it turns out, glad you do too!
And yeah, the idea we had was to have something like pressure plates that have to be switched on and off affecting multiple sides of the cube, so that you have to be aware of all the things happening on all sides.
Thanks for playing! Your idea about adding something to indicates the structure of the cube sounds great! It was on our minds too. Sadly we were still adjusting levels at the last minute so we couldn't add it in time. Anyway, thanks again for playing and your inputs! 馃槃