Ok, I finished it (only got the Time Stones though). There wasn't anything I felt was particularly wrong or bad, except a couple of pointers - - Some sound effects, particularly destruction sounds, are much louder than I feel they need to be. - I know this is personal taste, but I despise "running" bosses, like the first Metal Sonic fight. It's a pain in the arse. - The Planetary Panic boss...is it even possible to avoid the first laser? - Could you make the cutscene skippable when you are using a save? - Some hit boxes seem erratic. The laser from the large Scorpion Tank in PPZ seems to be quite big, and I'm sure I got hit by things in the special stages when I feel I missed them. Other than that, it's a really good game. The soundtrack is stellar (I love the 1-up jingle!), the art work is nice, and the level design is superb. Well done!