Also the type of game was probably to complex

Humm ... well it was a simple platformer ...

But i think the team just have lived what is the real world of game making ... a big nig amount of work ...

Yes, one way to achieve a working game, can be to go with retro or cartoon.simplified graphics ...
simpler gameplay, smaller levels etc ...

Too bad the video of the game just let supposed some great quality one, that could have goen to Steam GreenLight ...

The another point, is like i said the motivation, you are always very motivated at beginning and what arrives is just the lack of motivation sometimes.

Well like i have read on some old AUM magazines interviews some clever and bi gadvice for indie lonewolf :
KEEP IT SMALL FIRST laugh

If the team had kept smaller and less complex levels, simpler gameplay with one character, simpler graphics, the game could be completed.

Yes it was perhaps too comple, and choosing another game type could have been a better solution perhaps , like some MonkeyBall style game, you make simple but challenging levels and jut put a ball on them.

Well too bad for such great promising game.