Thats ironic? xD

Is it good or bad?

Wow.

Simple put, it has a few flaws, and a few good things to mention too.

Flaws first.

The control is very confusing. You can't map two actions to the same button (which is very silly, I don't need two separate buttons for jumping and confirmation) and the character's movement is just.... very wrong. In the original game, your character moves whatever the direction the player sees. So if Mario or Luigi is sideways, the player will have to use up and down to move him. Instead, the player needs to enter the relative direction - which is more confusing when this does not apply when the character is upside-down.

Then comes to the frustration. For example, I found one of the stages difficult enough in itself already, buy right after that? I was offered a chance to beat it again without any enemy kill? It's asking for the near-impossible! The difficulty curve gets a lot steeper by the time you have 6~7 stars or something. Not to mention the second boss is almost impossible to time. I may not be a good player, but at least pleeeease let me win after 3 or 4 attempts, no?

There's also one problem about this game's programming. Now, I see that the author didn't make everything, and there is a framework to work around. So if it's not your fault, blame whoever made the IDE... it's called "Multimedia Fusion" eh? The planetoids are all squarey, this is strange, yes. But not as starange as how you move relatively backward when jumping on a moving platform. This simply is not expected in a Mario game - or in real life physics either. And the whole walk backward/sideways thing simply is not mainstream in Galaxy - and it's for a good reason.

And I would like to see more flexible user interface, like an actual pause menu and support for widescreen.

Oh, and finally, there are two things I don't like - but it's just me. Those are not faults. One: background music: Why M&L? Two: death count. They're just there, silently telling players how unskilled they are.

Now onto the good things:

First off, the graphics. They aren't too superior in terms of graphic quality, but they do very well. Special effects are shown properly. Now if DirectDraw can be applied or even adopting vector graphics.... bah. I'm asking for too much.

Then comes the sound effects. They're used in the right places in most times (except possibly the SSBM/SSBB Lip's Stick effect for grabbing coins).

And the saving warning screen is ABSOLUTELY welcome here.