Few pretty minor flaws I noticed, one of the frames of the koopa marios jump animation is off, the ice boo? guy that freezes you kinda looks off it'd probably look better if his face animated with the color animation, going back to small mario after being hit could get annoying in sections where you need a specific power-up to get an item or pass through a level, firefox mario seemed to lose his special attack after beating a level?
The Koopa Mario animations are indeed incomplete. This is due to... I'm lazy and keep putting it off lol. The Boo freezes you for a second because in Pac-Man, eating a ghost temporarily freezes you. I'll tweak the ghosts a bit more so it feels a bit better. As for Mario going small when getting hit - this actually won't last. One thing not shown in this demo is the badge system. As you collect cherries, you buy badges in the game. The first badge that you can buy (and rather quickly) is to stop reverting to small Mario when hit.
As for FireFox Mario loosing hose special attack - that shouldn't go away. I'll have to investigate this bug.
I noticed I consistently fell through the winged red koopa in stage 3(?).
Also it was frustrating having the key Bowser drops fall into the lava, so you should probably have it spawn next to the door or at least in a fixed position. Oh, and landing on it and having Mario kick it automatically sucks if it's on the edge and again falls into the lava.
That difficulty curve on these sample stages stings! Yeowch!!\
And the pac-man style bonus stage was awesome!! The only thing is that Mario's speed was a little too fast and made it difficult to maneuver through close consecutive corners. Slowing that down a bit should help and make it feel a bit more like pac-man to boot.
The diagonal moving Koopa Troopa has an odd hit detection issue that I still need to fix. The lava issue has been something that no one had pointed out to me until this demo release. I plan to simply remove the level entirely once Bowser is defeated. And I apologize for the difficulty spike! These levels are pooled across several worlds so hopefully the difficulty spike isn't so bad! Also, the addition of badges should make certain levels easier. Once the game is complete and goes into final testing, I'll modify the game as needed to temper the difficulty.