Hello! Glastonbridge here!
If you find any bugs in Mr Beanbag, please report them on our website here
The falling through slopes bug is known about, but I still have no clue why it happens. It isn't a bug with "level 2-1" but can happen on any steep slope apparently at random. The worst sort of bug! Mr Beanbag's collision with the ground is the oldest bit of code in the whole game, being as it is a direct port of the original AMOS code that I've barely touched in the last 15 years, so it could probably do with a complete re-write.
I'm puzzled at the complaints about infinite continues however, if you don't want to continue you could always just select "new game" instead of "continue game" at any point you like.