Like Mr. Satire, I've been playing this game myself for about a month or so now. I was gonna make a post about it actually, but I've been so busy with shit that I just forgot to do so.

This game practically combines all the good stuff from all the classic Mario games: all the colored yoshis (plus a few new ones), the green shoe as well as a lava shoe and flying shoe, the ability to even play as Link, 2-player co-op with seamless, Toejam-&-Earl-style split screen... There's even a few cameo appearances like Mr. Saturn from Earthbound.

To those who may want to play with a controller, there's a program you can use called Xpadder that allows you to emulate key presses into the controller's buttons. If anyone needs some assistance with that, lemme know and I'll help you set it up.

BTW, there's also some cheat codes for this game if anyone wants to try them out. These can just be typed into the keyboard to activate (type again to deactivate). A couple of things to keep in mind is that once you activate a code, saving is disabled (unless you type in a certain code, wink wink) and all reserve box codes only apply to Mario and Luigi since they're the only characters in the game that have reserve item boxes. Anyway, here's the whole list:

needashell - reserve box holds green shell
needaredshell - reserve box holds red shell
needablueshell - reserve box holds blue shell
needayellowshell - reserve box holds yellow shell
needaturnip - reserve box holds turnip
needa1up - reserve box holds 1up
needamushroom - reserve box holds mushroom
needaflower - reserve box holds fire flower
needaniceflower - reserve box holds ice flower
needaleaf - reserve box holds leaf
needatanookisuit - reserve box holds tanooki suit
needahammersuit - reserve box holds hammer suit
needaclock - reserve box holds stop clock
needaplant - reserve box holds portable piranha plant
needagun - reserve box holds billy gun
needaswitch - reserve box holds P-switch
needabomb - reserve box holds bob-omb
needashoe - reserve box holds kuribo's shoe
needaredshoe - reserve box holds lava shoe
needablueshoe - reserve box holds flying shoe
greenegg - hold green egg that hatches into Yoshi
redegg - hold red egg that hatches into red Yoshi
blueegg - hold blue egg that hatches into blue Yoshi
yellowegg - hold yellow egg that hatches into yellow Yoshi
blackegg - hold black egg that hatches into black Yoshi
pinkegg - hold pink egg that hatches into pink Yoshi
purpleegg - hold purple egg that hatches into purple Yoshi
coldegg - hold cold egg that hatches into ice Yoshi
bombsaway - hold bomb
firemissiles - hold bullet bill
hammerinmypants - hold hammer brother
powhammer - hold POW block
boingyboing - hold spring
wherearemycarkeys - hold key
upandout - hold propeller block
burnthehousedown - hold propeller block with flamethrower
rainbowrider - hold rainbow shell
stickyfingers - hold anything you walk into (including enemies and items)
itsamemario - change player to Mario
itsameluigi - change player to Luigi
anothercastle - change player to Toad
ibakedacakeforyou - change player to Peach
iamerror - change player to Link
fairymagic - change player to a fairy
supermario2 - control both Mario and Luigi in the same level (press down + reserve item button to alternate)
supermario4 - make 4 clones
supermario8 - make 8 clones
supermario16 - make 16 clones
supermario32 - make 32 clones
supermario64 - make 64 clones
supermario 128 - make 128 clones
1player - change to one player mode
2player - change to two player mode
istillplaywithlegos - regenerate all blocks and tiles in level
donthurtme - cannot be hurt (pitfalls still kill you)
shadowstar - turn into silhouette and walk through walls
framerate - show framerate
sonicstooslow - speed up player
speeddemon - speed up game
wariotime - turn enemies into coins
iceage - freeze all enemies
ahippinandahoppin - multi-jump in air
wingman - unlimited flying (must possess leaf, tanooki suit or Yoshi)
captainn - pausing stops time (doesn't work if pause is set to Esc key)
moneytree - coin total skyrockets (retype code to stop)
flamethrower - rapid autofire (must possess fire flower, ice flower or hammer suit)
itsrainingmen - 1up mushrooms drop from the sky
donttypethis - bombs drop from the sky
wetwater - level goes underwater
imtiredofallthiswalking - opens all paths throughout the world map
illparkwhereiwant - walk anywhere on map