ENOL MARTÍNEZ how you can animate so many stuff? is pixel art easy to animate? you have some secret super duper technics, do you?
2- It depends on the detail that you want for the animations. I strongly recommend to use Aseprite, it's an easy and intuitive tool for everyone.
3 - I have a lot of experience doing animation... since I was 13. One of the things that helped me a lot when I started was the Principles of animation of Walt Disney. Here's a great video explaining them: http://vimeo.com/93206523
Will you release this in 2017 or later?
So, in our case, the game would come to life when we'll finish it. And none of us can tell when would it be. Our top priority is to make the best gaming experience that we can provide. We don't want to rush the production values so we don't have a final release date for the moment.
Could you give us an example of boss fight (like a teaser)
Indeed our backers and supporters will have the chance to play an entire level with its final boss instead of showing you a video teaser with how would it look like.
Do you know any good tutorial for pixel animation?
A developer named Alexey Garkushin posted a series of tutorials about pixel art making in general. They are quite interesting for a beginner (not all animation related but very useful): http://gas13.ru/v3/tutorials/sywtbapa_almighty_grass_tile.php
Animating pixel art is no different than doing it in other style. Aside from the technique and tools selected, the animation methods are practically the same. I always recommend to check out this wonderful tutorial that explains the 12 basic animation principles: https://vimeo.com/93206523
Also, if you are searching for a program to work with I encourage you to download Aseprite. Is cheap and easy to use (best pixel art drawing/animation tool out there).
Good luck with your future pixel creations! (￣▽￣)/