Not to bad when you, but at hight level it really became boring taking 4/5 hours to came back from missions . At around lev 30 probably most of people quit .
Good game.
It will be more interesting with a kind of market instead of buy resources for shiny , and different races for example one that produce more putty ,another more twigs , one balanced(like this we are using now) so the market will be more interesting (you can use shiny to unlock races) .
And really is too expensive to buy shiny , like others suggest you should lower the shiny price in kreds or lower the shiny need to buy stuff or speed up
really it will be nice game if I don't need to destroy my keyboard and my fingers just for jumping around , you should give more time between barriers or fix the keys or even both, they will became really annoing after 5 minutes of game, 2 stars for design and originality .