I'd say pretty alright, it however does have a lot of issues such as unforgiving level design with a bit too slippy controls, the art not being all that appealing and the story not really being engaging. It is really flawed but I believe it would've been a "better" product if it were to focuss more on a more appropriate difficulty curve, less narrow spike walls and others. I think the first 3 worlds of Super Meatboy would be good inspiration in case you dont want it to be a precision platformer.