What I need to make my 2d game good

Character Movements



This is a sprite sheet it's used for the animations of the characters, these are used for 2 dimensional games.


Dynamic Background


This is a background from the first sonic game, it's background is animated by using multiple frames, to
create the illusion of movement. 

Interesting Boss Battles


To make an effective boss battle, I should make them tougher than the average enemy obviously, put down different things you have to destroy or collect before you can
hit the boss, have a different soundtrack, vary your bosses attacks as they weaken. 















I also think that it's interesting to have a different way to defeat a boss, like beating them in a race, a good example of this is Sonic CD.