Because you're asking for constructive criticism, I'll speak up.

I like the simplicity of the game, and the very basic platforming challenge. The level design isn't bad, and the hanging bulb adds some nice ambiance, suggesting a small backstory. The character isn't just in a well because "platforming". He's down there collecting coins. It's a mission. I also think you did a good job balancing the life meter. It's a nice way to keep the game challenging. Not only does the player have to master the jumps, but he wants to avoid falling. Thing is, you made a nice, long life meter. The character takes a beating before the game ends. That is, we have incentive not to miss jumps, but not enough to annoy us by killing the character too soon.

The problem I have --and I've said this before to developers-- is that slippery movement in platforming games is a bad idea. In this one, you expect us to make tight, accurate jumps and small pinpoint movements, but you give us a character who's nearly incapable of pulling it off. When we move left or right, the character does a sudden about face and slides forward, which makes him especially unequipped to handle tiny platforms. So it's not a matter of how good we are at jumping and landing, it's a matter matter of how good we are at fighting the character's lack of finesse.

Now, I know you said that this was intentional, as a way to make the game harder. But here's a good rule to follow: never make a game harder by giving it poor controls. This is what people mean when they say a game is hard for the wrong reasons. It's mechanical problem, the fault of the developer, rather than an honest challenge. Trust your skills in building good levels; don't artificially pump up the difficulty by making us fight the game. A good platformer has tight, dependable controls.

Not bad only problems are that the horizontal movement is sensitive (we know that) and that there are no sounds. The background moves a little so I don't know if you should keep it that way or make it move a little bit more. Overall it's good but you could make some fixes.

Concept is good. Difficulty in the level progression is well done.
I tried 3 times but could not cross level 11. Horizontal movement is very sensitive so I was not able to complete level 10 without losing much life. Not able to get easily into the middle block of the the lowest platform with 4 blocks in level 10. Level 11 requires very precise jumps with good timing, with limited life I was not able to get through.
Hardcore platform players might enjoy this challenge but for normal players like me some sort of health packs and restarting level with better health might help to complete the game.

character feels slidy also i find that you have to restart if you accidetally touch the basket without collecting the coin

The concept is amazing: Platformer where collecting coins to exit the goal is always exhilarating among gamers. But there are some issues, the game feels empty among the lack of music so try to lighten up our coin collecting with nice background tunes. Also the game area is really large but the potential of the way you could design the levels are being misused on some levels while others (2 & 5) feel like a long shot sometimes. So make it interesting but don't make it impossibly wild. Other than that I'd like to say that the coins is an awesome feature. So why stop at just one coin per level? Go nuts! Make the player want to come back if they didn't get them all. Besides all of this I'd like to say great game and good job on your hard work!