For many years we had been waiting for a decent Puzzle Bobble clone, then Monster Buster happened in 2013 as part of the RGCD competition.
Before that, there were a few attempts at converting the game – and Busta was one of those more successful looking conversions. Back in 2001, a very promising preview was released with up to two players. It was lacking a bit of polish, but the mechanics all seemed to be in place.
It seems strange that a conversion looking so good would be left to collect dust, but that is what happened to Busta. Possibly Daniel Berntsson had other projects come up which took over life.
We hope to hear from Daniel sometime to find out exactly what happened, and maybe if there is anything more to the game out there to be discovered.