If it is your first game ever, that is actually very impressive. Sure, the gameplay is kind of generic and some platform sections feel a bit unfair but otherwise the game is very clean and has a lot of features that many other entries lack, like the level selects screen, the option menu, and the jump buffer. The visuals and sounds feel very good and I really like the dash/roll (maybe you can remind the player about that ability the first time they have to use it because I had to go back to the main menu to look at the controls). I also prefer when the jump buffer only registers button presses when they happened right before landing, because sometimes the character jumps when I don't want it.
Overall, that's a pretty solid entry. Well done!