Awesome game, took me a few hours to complete and collect everything.
It was a great task to get that 20-25 stamina to at least get somewhere near the end of the final boss.
Loved the hidden costumes that only the endboss randomly can spawn in (Pacman and Superman) and all other references xD
Little tip for people who can't get past a certain boss: get some decent hp and always have at least 3hp per second heal after the 2nd boss.
The last 2 ones can just be done with Masterchief in the rear (heals 4/sec).
My fav team from front to back: Link, Vader/Mario, Mixed sniper (pacman head, yellow MC top, red turtle secondary weapon and Megaman weapon) and Masterchief.
There are some glitches and bugs in the game though, like being able to fall through the floor or fighting on 2 different heights at once.
For any other completionists out there, just camp the final boss for the remaining pieces, some people are rarer than others but you can get everyone from him.