It's nice, styled like the 1983 Mario Bros. game, but there's things needed to improve on.

-I think that when you die, the music should keep playing normally, instead of resetting on every death.
-Setting up a timer would definitely help people keep playing instead of wondering when the game will end.
-There's a pit at the bottom, that I learned you can jump from using Space Bar, but since it wasn't mentioned, I was wondering how to get back to the top for awhile.

I'm sure that with time a lot of things will be improved from here on(ex: music, graphics, ideas etc. so I won't nitpick that). Keep doing what you're doing!

I'm a fan of the game's 8-bit art style, and the (what I assume) purposefully bad controls make for a funny little game. The game is really simple and fun, but it gets boring quickly. There should be more game modes or a way to see your score as you're playing.

Despite its simple and short concept, this is a decently developed game. The controls and the fluid+fast-paced gameplay work together very well.
It'd be great if this game had more modes or some sort of challenge, since if you lose there aren't any major consequences besides respawning at a nearby point. No scores neither.

Nevertheless, this is a good game to improve on or to take some mechanics from and implement them into future projects ;)