Okay first, the game is called I Wanna be Someone, not I wanna see the world. Also, I swear I've seen someone else post this same fangame not to long ago.
Anyway, to many invisible blocks, needs less spikes and more creativity. Needs new music, not the same. Needs a game mode screen (for normal, hard, impossible, etc). Needs more work, but i've seen this fangame before. So not sure if you posted the wrong file or that's your game. Should check that.