D'Awww, a grammar nazi, cute.
Anyway, I liked this game. It has beautiful graphics and a fun and catchy tune. It was just the gameplay and lack of content that gets it a low score from me.
The levels "Remember me?" and "Just one" were very poorly made levels when considering the laggy jump that sometimes just doesn't work, mixed in with pixel-perfect jumps. A challenging game is fun, but adding levels that some users will find impossible no matter how many times they try? Not fun. Game breakingly not fun.
As for what you could add? Power-ups are an obvious choice, such as; Higher jumping (limited time use?), flying, speed boost, ghost wall-walking, immortallity. How they could be implememnted into the game is obviously your choice.
And a story? A story would be good. Why is RAINBOWMAN jumping through increasingly deadly cave systems to reach a chamber door? Is it his hobby? Does he get a big buzz of it?
And how about some puzzle elements and collectables? :)
As for Herukel calling "Remember Me? "ridiculoud"? If you really have such a low IQ that you can't understand a mispelt word and need everyone to use Sp3ll Ch3CKS, then I feel much pity for you, DelishusCake.