player movement is too slippery
feels fine to me. its supposed to be fast paced.
collisions between enemies often fail (pass right through them)
When specifically do collisions not work? If you mean after changing characters then its because after collecting a muffin you gain temporary invincibility indicated by the spinning star located on your character.
kassadin's hitbox is too large, making it hard to make vertical jumps.
Then its working as intended. The difference of size between some characters adds to the challenge of the game requiring you to think twice before moving somewhere a smaller character could easily travel to.
delay on kassadin's riftwalk makes it difficult to time properly (and is not a very useful skill anyways)
I'll consider shorterning the delay.
Also, being able to clear out a whole row of enemies in few seconds seems pretty useful to me.
mario's fireball travels too slow
I disagree. Making it faster would just increase the chance of it hitting a wall than an enemy. Try to estimate the direction and enemy would go in before shooting a fireball.
having that chip select dialog show up every time you get megaman disrupts flow. I would remove it, as well as the "battle start" thing.
I thought about that. I'm not going to remove it as I'll be adding in many better chips in the future, but I'll probably add in an option to disable the chip select screen when you first change into megaman EXE. Do you think that will help perhaps?
map feels too small
Adding in more maps is on my to do list.
the entire game uses the arrow keys and shift key but when you get viewtiful joe you add more buttons. would be better if you keep it simple, give each character a single defining move with one key and perhaps different movement functions using the arrow keys (like you did with mario) and that's it.
I think the mulitple abilities of some characters adds to the fun of the game. Also it creates new opportunities to escape a crowd of enemies or to take them down. For example using VJ's zoom.
also it's a bit confusing that some characters can jump on enemies and kill them but some cannot. in my opinion you should give all of them that ability or none of them should have it.
It does take some getting used to, but I am thinking about adding in a powerup that allows everyone to jump on enemies.
it's an interesting idea for a fan-game, but it's still a fan-game (the lowest form of game imo)
I disagree. Some fan games are excellent and a blast to play. See: Psycho Waluigi and Toad strikes back.
and it's not just a fan-game is a clone of game that's a clone of another game. so it's like you're trying your hardest to not be original
I tried to make the core mechanics (enemy types, level design, etc) the same as those two, but as far character usage and character ability goes, I'd say its pretty unique.
Thanks for the feedback dude.