The Basics The first thing I do when I start a new game is change the first player controls. It helps a great deal if you use keys that are more familiar to you. Go to Options, click each command, and then press the key of whatever you want to change it to. Assign the Punch and Kick commands to keys that are close to each other and easy to press quickly. This becomes important when you perform a special attack. During the game, if you need to pause at any time, click the Options button at the bottom of the screen.
Special Attacks A lot of people have reported having trouble performing them, so I'll explain them here. Pressing Punch-Kick-Punch-Kick will make the feepit do a roll-attack, and Kick-Punch-Kick-Punch will make him launch himself at the meepit. You can't just button-mash, the combo won't work. You have to give the feepit time to punch and kick seperately. Press each key slowly but steadily. If the combo is interrupted because you pressed the wrong key, it won't work and you'll have to start over. Note that you can perform special attacks while moving forwards or backwards, or even while jumping.
Stages One through Four The stages get progressively more difficult, but Stages 1-4 shouldn't present a real problem. All the meepits will try to block your attacks, both normal and special
Winning by Losing How do you get a high score in this game? You'll have to lose some rounds2 each stage, to be exact. The point of losing some rounds is so you can fight him 5 times each stage instead of 3, thus getting more points. Win a round, then lose a round, then win, then lose, and then finally win the last round to finish the stage and move on. Make sure you get in as many hits as possible on the losing rounds without killing the meepit (it might take some practice before you figure out how much damage you can inflict while keeping him alive). You must win that final round so you can advance to the next stage! You'll have at LEAST 3000 points by the end of the game if you play it this way, and a shiny new avatar.
Basic Strategy I've found that the fastest and easiest way to finish a round is to perform special attacks over and over. This gives you between 100 and 140 points each round, depending on how many hits you get in. A normal hit gives you about 6 points, a special attack nets you about 19. Special attacks also knock the meepit out quicker. Don't worry about getting hit, you don't lose points. Additionally, you get 100 bonus points when you finish a stage. If you race through the game, winning every round, you should wind up with about 2000 points. Not bad, but not very many neopoints (only 500) and you won't get the avatar or a trophy.
Beating the Fire Meepit Honestly, this meepit is really no harder than the others, if you use the strategy above. Don't let him psych you out. Regular attacks are practically impossible in this stage, because if you're close enough to hit the Fire meepit, he'll just block you non-stop. This is why Special Attacks are your best friend here. Let him get within range, and then perform the special attack of your choice. While he's down, back away and perform the attack again. Remember that you CAN perform a special attack while moving, so press the keys while backing up; it'll help you hit him more quickly. Keep repeating this - special attack, then back away; special attack, then back away. Hit him and run until you win the round. Remember, you still have to lose two rounds if you want maximum points. Hit him as much as possible without killing him. The toughest problem you might run into is getting the Fire meepit to attack YOU after you've whittled his health bar down