This is easily one of the most important fangames ever made, being one of the First sonic fangames created and one of the best from its era, and of course... it lead to the creation of Sonic Robo Blast 2, one of my favourite games of all time!

Going back to it is definitely rough and, I'd recommend most people experience it through "SRB2 the past" instead since it includes it as a level pack.