Definitely not ruined. Far from it; that looks like a great start that'd be perfectly fine for growing plants in. You can always work in more manure next spring if you find it neccesary.
If you have some aged manure, you can also mix in maybe half a handful under each plant as you plant them. That's what I normally do.
The only thing I'd suggest doing is making sure you mulch
to retain moisture and keep the soil cool. If you got more cardboard or straw
, that'd work fine, or woodchips are even better (or straw and then woodchips!).
I'd also encourage you to see if you can find free sources of mulch and manure. You're literally buying animal poop
and shards of wood
- surely someone nearby would be happy to give you some if you look hard enough.
city/county has a free pile 14ft tall of woodchips where they dump the shredded wood from cutting tree branches away from powerlines or after storms. My local dump has composted yard
waste (warning: may be herbicide heavy, so I use it on test beds first). A nearby neighbor raises cows. If you are interested in free garden stuff, most of it is probably available for you.