I think some are premade sprites (i might be wrong there) but the sprites you made yourself look pretty nice. I like the fact that you added music and sound effects into your game (the music doesnt really fit all that well, but I appreciate the fact that you added it anyways).
There are some issues that I must address. The first issue I have is that you can easily avoid all the obstacles by floating over them. When you do hit them, the lasers have too big of a hit box and will kill you before you touch them. Maybe just reduce the hitbox to better fit the sprite. In addition, if you die too many time you will spawn right nex to the void and you will just fall through. It might be best to respawn at the start of the level.
Otherwise, a good attempt at a runner, item collection game.