Here is my playthrough of your game bro:
https://www.youtube.com/watch?v=4wtmh-ScUUc
I noticed a few things:
The platforming -
Some characters like Batman and Superman or whoever could fly have no problem but other characters ilke Flash have an incredible amount of difficulty as they run up the corners of the stages then launch themselves towards the platform, and if there is a guy on a platform shooting you it makes it even more difficult.
On the platform stages if your on a building and fall off into a hole the character reappears like he just super jumped all the way onto the top of the stage!!! One time when I fell off the stage I got launched to the moon and didn't come back lol!!! I was playing as Superman on the stage where you fight Cyborg Superman!!
For the platforming stages with flying characters you can just fly by the stage and just get to the boss!! Don't know if you mean to do this or not!!
There are quite a few obstacles blocking the view of the characters I noticed this on the second Gotham stage after the tutorial where there is a fence and a whole bunch of clowns waiting for you!!
Gameplay -
I'm not a fan of the different attack buttons as special moves, I expected the moves to be more like your Marvel Infinity Wars game, but that's just a personal opinion!!
I was wondering if there was going be more enemies than just Batman and Superman enemies but there wasn't and for a game called Justice League it didn't have that, unless your planning to do a sequel down the line!!
Palettes, I was looking to see what awesome palettes you would create for the heroes but there wasn't none!!
After the driving/flying stages the characters restart there lives back to 3 this is the same error that the Avengers United game has so I don't know if it's something to do with the engine!!
The Story -
I noticed for the Story it's just the Death of Superman story, with Justice League characters thrown in!!! I really wanted to see an Wonder Woman or Aquaman stage in there!! And I wanted to play them in there respective stages but it just wasn't there!!
And since the stages are just Batman and Superman I didn't feel to do a playthrough with the other characters besides them!! As I would feel Flash would be fighting Clowns in Gotham for example as it doesn't fit them!!!
Also, if this team was the Justice League I don't think Superman would have died, but again I think this is the movie version your going for!!
Overall, not a bad game, hell, I'm glad someone finally did a Justice League but needs quite a few additions or update!!! Again sorry if this wasn't the feedback you wanted and didn't wanna sound like an ass just wished this game was a little bit better (probably because my excitement level was very high for this game)!!!
And you can bet your ass I'll be looking forward to the sequel lol!!!
Thanks again for your game man!!