The pixel art is good but the level design and gameplay are terrible. I think you should play and analyze super mario games. If it's your first time (it was my first time), great job. Congratulations. 

Hard. As. Nails! I can only get past the first, moving baddie one time in about 10! I think a tiny bit less 'slide' would be good, too, for the bits where you have to land on a sixpence. Needs a timer, ofc, but solid overall. Well done!

I am unable to open the application :/