It isn't a bad game, but it could've been better. Would be awesome if you made the collision for spikes smaller.
Also, the music and art aren't the best. I checked your profile and this isn't your first game.
Lil' bit of music theory https://www.youtube.com/playlist?list=PL_yd4ERN4Vtu3oPfjawcDmNBVoJj40v0X
Pixel art do's and don'ts
Remember, practice makes you better.