all right
Well, to start off i'd really like top say that Mario is a WAY overused topic. At least you added another little version of it, where everything is apparently old. Not all that creative but better than just another crappy online version of it. Probably would be better if it was not so slow, even though that is probably suppose to be like that because of the whole "elderly" thing.
As for the gameplay, i see quite a few issues. First of all, your coding really needs work and so does the amount of effort you put into making these. Some things i noticed was the uselessness of the controls. Simple codes often aren't exacly what you need and when beginners make rpgs/sidescrollers the jumping is often "soft" and it's a bit awkward to jump over things. something I also noticed was the apparent sloppiness of the collision detection points. This is a very bad thing as gliches often occur when there's this. For example, I got stuck ontop of a brick once. Then there's just some aspects of Mario games you forgot. For example, the mushrooms move. There probably are a couple others but I did not manage to beat the game to to a nearly impossible part. (The one with a bunch of pipes in a row) Some other glitches I saw were: The inablity to jump when on a pipe, the fact that you always die if you land on a goomba while holding the w key, a lack of creativity in gameplay and so on.
Now, the graphics are quite a problem. What most of them were were just slightly recolored Mario sprites. On top of that, they were unneccerily low quality. The game isn't even 1mb and you have to compress the sprites. Hmm... Well I was actually quite displeased with the lack of beefy menus and original art. If you ever want to make entertainment, graphics are a must. Since you probably didn't I won't say much about the sprites. One last thing about graphics; super mario bros did not use baby kruffy font. Try to remember that.
As for the sound, just try adding better timing and again, way better quality. Your also going to need some better sound effects too. Maybe like a little flap or something when the koopa dies. The music was just not pleasant at all. I'm sorry, the elderly Mario theme just sounds demented.
Overall, I wouldn't say it was bad a first attempt. If you really want to make a good Mario game, don't just update this one. It's not worth it. Just start over, maybe practice making sprites, work on originality and find some coding instructions. You never know, you might be really good some day ;)
-polles