If I were to make one major change to Sonic Advance it's in accessing the Special Stages
Dimps always had a problem of making accessing the Special Stages a huge, unbelievable headache for a 30 second boss that's not really all that spectacular anyway, but one Spring? Across two Acts per zone? Some of which I'm convinced are impossible for Sonic to even reach? And you only get one shot at it?
I would at the very least let you give it another go for fuck's sake