OK, played it straight first and it's solvable again. It's still possible to solve the second and third rooms using the cube from the first room. You could just call that an extra challenge.

It doesn't seem to be possible to solve at all now - there seems to be no way to get that second HEP into the carcher.

I can't play it, I don't have Bee.

Try it now tell if still easy to beat (I mean is it sill able to be done with two cubes),

Played through the first time as intended, I think. I did get lucky, having rolled the ball through the laser grid (thinking that's what was needed) and it rolled out without my needing to go get it. That said, on a second playthrough I was able to complete the map with only the ball and the first cube, the second and third were not needed. If you eliminated those, it would be a bit more of a challenge. Other than that exploit, didn't notice any bugs. Thanks for the update.