The music was pretty chill and the sprites were pretty good.
I moved left on the first level and fell off the map you might want to put a wall in there. I also got random room 1. I played again to count the dogs, counted 8 dogs and also got random room 1. That's pretty sneaky if there's only one random room. The jump noise plays whenever u press the jump button even if you can't jump. Also, there's a small delay when you land before being able to jump again.
Everyone's first games are bad, don't worry about it. Listen to criticism and make a better one next time.